. How many thousands make a lakh?
7. How many thousands make a crore?
8. How many lakhs make a million?
9. How many millions make a billion?
10. Write the smallest 3-digit number which does not change if the digits are written in reverse
order.
11. Successor of 1360700 is __________.
12. Predecessor of 900800 is __________.
13. 754 + 235 = 235 + ________.
14. 2456 + ________ = 1236 + 2456.
15. There is a whole number which when added to another whole number, gives that number.
Mark True / False.
16. If A, B, C are three whole numbers then (A + B) + C = A + (C + B). Mark True / False.
17. 6542 + (361 + 175) = (361 + _____) + 175.
18. Find out the sum by suitable arrangement.
1 + 2 + 3 + 4 + 5 + 95 + 96 + 97 + 98 + 99
19. Find out the sum by suitable arrangement.
2 + 3 + 4 + 5 + 45 + 46 + 47 + 48
20. If A and B are two whole numbers such that A > B or A = B then A - B is a ________
number
Answers
Ans 1. 100 × 1000 = 1,00,000
= 100 × thousand = 1,00,000
= 100 thousand make one lakh.
Ans 2. 10,000 × 1,000 = 1,00,00,000
= 10,000 × thousand = 1,00,00,000
= 10,000 thousand make one crore.
Ans 3. We know that 1 million = 1,000,000
= 10 × 1,00,000 = 1,000,000
= 10 lakhs make one million.
Ans 4. We know that :
=> 1 billion = 1,000,000,000
=> 1 million = 1,000,000
Now, 1,000 × 1,000,000 = 1,000,000,000
= 1,000 millions make 1 billion.
Ans 5. Smallest 3-digit number = 1000
= By calculating simply we find that :
=> 999 is the only number whose digits didn't change on writing in reverse order.
Ans 6. We know that :
= Successor is + 1 to a number.
=> 1360700 + 1 = 1360701.
Ans 7. We know that :
= Predessor is -1 to a number.
=> 900800 - 1 = 900799
Ans 8. By associative law :
=> 754 + 235 = 235 + 754.
Ans 9. By associative law :
=> 2456 + 1236 = 1236 + 2456
Ans 10. False
= There is no such whole number.
Ans 11. True
=> Reason : By commutative law.
Ans 12. 6542+(361+175)=(361+6542) + 175.
=> By commutative law of addition.
Ans13(99+1)+(98+2)+(97+3)+(96+4)+(95+ 5)
=> 100 + 100 + 100 + 100 + 100
= 500
Ans 14. (45+5) + (46+4) + (47 + 3) + (48 + 2)
=> 50 + 50 + 50 + 50
= 200
Ans 15. If A and B are two whole numbers such that A > B or A = B then A - B is a new number.
Hope it will help you...