Part One
Lesson 2 – Number Work
Solve the following examples.
1. Using any of these number cards make ten three-digit numbers and read them.
(Remember that you cannot have zero in the hundreds place.)
1, 2, 3, 4, 5, 6, 7, 8, 9, 0
Ans: 123, 234, 345, 456, 567, 678, 789, 891, 912, 345
2. Write the following numbers in words.
(1) 325
Ans: Three hundred and twenty five
(2) 549
Ans: Five hundred and forty nine
(3) 667
Ans: Six hundred and sixty seven
(4) 782
Ans: Seven hundred and eighty two
(5) 890
Ans: Eight hundred and ninety
(6) 401
Ans: Four hundred and one
3. Write the following numbers in figures.
(1) Hundred and two
Ans: 102
(2) Three hundred and twenty
Ans: 320
(3) Five hundred and sixty-seven
Ans: 567
(4) Four hundred and forty-five
Ans: 445
(5) Nine hundred and ninety-nine
Ans: 999
(6) Seven hundred and fifty-six
Ans: 756
4. Write the next three numbers.
(1) 399, ___, ___, ___
Ans: 399, 400, 401, 402
(2) 200, ___, ___, ___
Ans: 200, 201, 202, 203
(3) 597, ___, ___, ___
Ans: 597, 598, 599, 600
5. Write the three previous numbers.
(1) ___, ___, ___, 600
Ans: 597, 598, 599, 600
(2) ___, ___, ___, 369
Ans: 366, 367, 368, 369
(3) ___, ___, ___, 299
Ans: 296, 297, 298, 299
Look at the symbols. Write the number and read it.
Ans:
Exercise
1. Write the given numbers in figures.
Ans:
2. Read the numbers
Ans:
1. 1001 – One thousand and one
2. 1010 – One thousand and ten
3. 1100 – One thousand one hundred
4. 2002 – Two thousand and two
5. 2020 – Two thousand and twenty
6. 2200 – Two thousand two hundred
7. 4004 – Four thousand and four
8. 4040 – Four thousand and forty
9. 4400 – Four thousand four hundred
10. 5051 – Five thousand and fifty-one
11. 5105 – Five thousand one hundred and five
12. 5150 – Five thousand one hundred and fifty
13. 5501 – Five thousand five hundred and one
14. 3067 – Three thousand and sixty-seven
15. 3607 – Three thousand six hundred and seven
16. 3670 – Three thousand six hundred and seventy
17. 3076 – Three thousand and seventy-six
18. 7038 – Seven thousand and thirty-eight
19. 7308 – Seven thousand three hundred and eight
20. 7083 – Seven thousand and eighty-three
21. 7830 – Seven thousand eight hundred and thirty
22. 9000 – Nine thousand
23. 9009 – Nine thousand and nine
24. 9090 – Nine thousand and ninety
25. 9900 – Nine thousand nine hundred
3. Read the given numbers. Write them in words.
Ans:
1. 1235 – One thousand two hundred and thirty-five
2. 2341 – Two thousand three hundred and forty-one
3. 3507 – Three thousand five hundred and seven
4. 4115 – Four thousand one hundred and fifteen
5. 5045 – Five thousand and forty-five
6. 6787 – Six thousand seven hundred and eighty-seven
7. 7890 – Seven thousand eight hundred and ninety
8. 8888 – Eight thousand eight hundred and eighty-eight
9. 9007 – Nine thousand and seven
4. Using each digit only once, write five four-digit numbers and read them.
Ans:
1. 2367 – Two thousand three hundred and sixty-seven
2. 2376 – Two thousand three hundred and seventy-six
3. 2637 – Two thousand six hundred and thirty-seven
4. 2673 – Two thousand six hundred and seventy-three
5. 2763 – Two thousand seven hundred and sixty-three
Ans:
1. 5980 – Five thousand nine hundred and eighty
2. 5809 – Five thousand eight hundred and nine
3. 9058 – Nine thousand fifty-eight
4. 8509 – Eight thousand five hundred and nine
5. 9085 – Nine thousand eighty-five
5. On a number slate, write different four-digit numbers by changing, one at a time, digits in different places. Read each number
Ans:
Ans:
Read the following numbers and write them in words.
20,000 = Twenty thousand
80,000
Ans: Eighty thousand
68,000
Ans: Sixty eight thousand
54,000
Ans: Fifty four thousand
79,000
Ans: Seventy nine thousand
99,000
Ans: Ninety nine thousand
Exercise
1. Read the numbers, write them in figures.
(1) Forty thousand
Ans: 40,000
(2) Fifty thousand fifty
Ans: 50,050
(3) Twelve thousand, three hundred and thirteen
Ans: 12,313
(4) Forty-five thousand and three
Ans: 45,003
(5) Twenty-three thousand, one hundred and five
Ans: 23,105
(6) Sixty-eight thousand and five
Ans: 68,005
2. Read the numbers, write them in words.
(1) 52,045
Ans: Fifty two thousand and forty-five.
(2) 23,409
Ans: Twenty three thousand, four hundred and nine.
(3) 45,600
Ans: Forty five thousand and six hundred.
(4) 41,000
Ans: Forty one thousand.
(5) 99,999
Ans: Ninety nine thousand, nine hundred and ninety nine.
(6) 95,768
Ans: Ninety five thousand, seven hundred and sixty eight.
3. On the number slate alongside, write five numbers by changing the digits in the units, tens, hundreds, thousands and ten thousands places, one at a time. Read the numbers.
TTh Th H T U
2 3 4 1 1
Ans:
1. 23411 – Twenty-three thousand four hundred and eleven
2. 42113 – Forty-two thousand one hundred and thirteen
3. 11324 – Eleven thousand three hundred and twenty-four
4. 34112 – Thirty-four thousand one hundred and twelve
5. 12314 – Twelve thousand three hundred and fourteen
4. Using each of the digits 9, 5, 6, 1,8 only once, write six five-digit numbers.
Ans:
1. 95618
2. 61859
3. 89516
4. 56189
5. 19856
6. 86591
5. Write the biggest number that can be made using the digits 1, 5, 6, 4, 7
Ans: The biggest number that can be made using the digits 1, 5, 6, 4, and 7 is 76541.
6. Write two numbers by writing the digits 4, 3, 9, 8, 7 in the ascending and descending order.
Ans:
Ascending Order: 34789
Descending Order: 98743
7. Keeping 7 in the unit’s place, use all the digits 6, 0, 7, 5, 4 to make five numbers. Write the numbers.
Ans:
1. 60747 – Sixty thousand seven hundred and forty-seven
2. 50477 – Fifty thousand four hundred and seventy-seven
3. 70457 – Seventy thousand four hundred and fifty-seven
4. 64707 – Sixty-four thousand seven hundred and seven
5. 57047 – Fifty-seven thousand forty-seven
8. Write five numbers, keeping the smallest of 4, 9, 3, 5, 1 in the unit’s place.
Ans:
1. 43921 – Forty-three thousand nine hundred and twenty-one
2. 59371 – Fifty-nine thousand three hundred and seventy-one
3. 34981 – Thirty-four thousand nine hundred and eighty-one
4. 53491 – Fifty-three thousand four hundred and ninety-one
5. 91461 – Ninety-one thousand four hundred and sixty-one
Exercise
1. Write the following numbers in the expanded form.
(1) 7,545
Ans: 7,000 + 500 + 40 + 5
(2) 4,050
Ans: 4,050 = 4,000 + 0 + 50 + 9
(3) 65,100
Ans: 65,100 = 60,000 + 5,000 + 100 + 0 + 0
(4) 8,000
Ans: 8,000 + 0 + 0 + 0
(5) 12,745
Ans: 10,000 + 2,000 + 700 + 40 + 5
(6) 78,999
Ans: 70,000 + 8,000 + 900 + 90 + 9
(7) 9,392
Ans: 9,000 + 300 + 90 + 2
(8) 50,105
Ans: 50,000 + 0 + 100 + 0 + 5
(9) 70,495
Ans: 70,000 + 0 + 400 + 90 + 5
(10) 82,727
Ans: 80,000 + 2,000 + 700 + 20 + 7
2. Write the numbers from their expanded form.
(1) 3,000 + 200 + 50 + 7 = 3,257
(2) 10,000 + 5,000 + 1
Ans: 1501
(3) 4,000 + 500 + 10 + 3
Ans: 4,513
(4) 20,000 + 300 + 40 +5
Ans: 20,345
(5) 7,000 + 80 + 3
Ans: 7,084
(6) 90,000 + 90 + 2
Ans: 90,092
3. Some digits and their places in the number are given below. Write down the numbers they make.
For example:
5 TTh, 2Th, 3H, 2T, 1U – 52,321
9H, 8TTh, 5U – 80905
(1) 7U, 2T, 5TTh, 9Th
Ans: 59,027
(2) 3H, 4Th, 5T, 1TTh
Ans: 14,350
(3) 5T, 8Th, 7TTh
Ans: 78,050
(4) 5Th, 7TTh, 3H, 2T, 4U
Ans: 75,324
Exercise
Write the place value of the underlined digit in the following numbers.
(1) 1,999
Ans: 90
(2) 2,345
Ans: 2,000
(3) 2,000
Ans: 0
(4) 4,835
Ans: 800
(5) 3,749
Ans: 9
(6) 27,859
Ans: 7,000
(7) 67,777
Ans: 700
(8) 56,708
Ans: 50,000
(9) 30,050
Ans: 0
Exercise
Work out and write different breakups of the numbers given below.
(1) 679
Ans:
Six hundred and seventy-nine units
Sixty seven tens, nine units
Six hundred, seven tens, nine units
(2) 863
Ans:
Eight hundred and sixty-three units
Eighty six tens, three units
Eight hundred, sixty tens, three units
(3) 6745
Ans:
Six thousand, seven hundred and forty-five units
Sixty seven hundred, four tens, five units
Six thousand, seventy four tens, five units
Six hundred and seventy four tens, and five units
(4) 9856
Ans:
Nine thousand, eight hundred and fifty-six units
Ninety eight hundred, five tens, six units
Nine thousand, eighty five tens, six units
Nine hundred and eighty-five tens, and six units
(5) 1027
Ans:
One thousand, twenty-seven units
Ten hundred, two tens, seven units
One thousand, two tens, seven units
One hundred and two tens, and seven units
Exercise
Write the number just after and the number just before the given number.
Ans:
Exercise
Complete the following table.
Ans:
Exercise
Write the numbers in ascending and descending order.
(1) 2345, 2349, 2347
Ans:
Ascending Order: 2345, 2347, 2349
Descending Order: 2349, 2347, 2345
(2) 6000, 5070, 3007
Ans:
Ascending Order: 3007, 5070, 6000
Descending Order: 6000, 5070, 3007
(3) 5007, 2007, 3007
Ans:
Ascending Order: 2007, 3007, 5007
Descending Order: 5007, 3007, 2007
(4) 1009, 1900, 1090
Ans:
Ascending Order: 1090, 1009, 1900
Descending Order: 1900, 1009, 1090
(5) 4180, 6180, 7180
Ans:
Ascending Order: 4180, 6180, 7180
Descending Order: 7180, 6180, 4180
(6) 2917, 3456, 1357
Ans:
Ascending Order: 1357, 2917, 3456
Descending Order: 3456, 2917, 1357
See the digits in the units place and say whether the number is even or odd.
35, 67, 32, 30, 43, 34, 51, 56, 88, 79
Ans:
35: Odd Number
67: Odd Number
32: Even Number
30: Even Number
43: Odd Number
34: Even Number
51: Odd Number
56: Even Number
88: Even Number
79: Odd Number
Exercise
1. Read the numbers given below and write them in words.
(1) 20,504
Ans: Twenty thousand, five hundred and four
(2) 97,487
Ans: Ninety-seven thousand, four hundred and eighty-seven
(3) 30,008
Ans: Thirty thousand and eight
(4) 4,879
Ans: Four thousand, eight hundred and seventy-nine
(5) 6,405
Ans: Six thousand, four hundred and five
(6) 893
Ans: Eight hundred and ninety-three
2. Where have you seen international numerals being used?
Ans: International numerals, also known as Arabic numerals, are the numbers we use every day, like 1, 2, 3, and so on. We see them in books, on phones, on computers, and everywhere we count things like candies or toys. They are the numbers that make it easy for people all over the world to understand and use numbers together!
3. Find prices of things written in Devanagari numerals and read them.
Ans: Students should do this on their own.