Answer all questions :
1. Round off each of the following numbers to the nearest thousands :
a) 683
b) 1526
c) 37094
d) 194 827
2. Find the sums of each of the following :
a) 2658 + 11467
b) 9237 + 45658
c) 6045 + 98799 + 76545
d) 23989 + 98765 + 65467
3. Calculate each of the following :
a) 88975 – 45876
b) 76089 – 8567
c) 964884 – 34593 – 76766
d) 429102 – 20876 – 44536
4. Calculate each of the following :
a) 506 X 6
b) 9878 X 23
c) 74 X 33 X 25
d) 34 X 15 X 56 X 26
5. How much should be added to 48692 to get 90000 ?
6. Mr Lim has 286 durians. Mr Tan has 65 durians more than Mr Lim. If each of them sells 190 durians, what is the total number of durians left ?
7. 121, 100, ...., 64, 49. Fill in the blank.
8. How many prime numbers are there between 30 and 55 ?
9. Find LCM of 14, 35, and 42.
10. Find the lowest common multiple of 12 and 18.
11. Find the highest common factor of 36 and 54.
12. Find HCF of 42, 70, and 98.
13. The product of HCF and LCM of 8 and 12 is .....
14. 42, 39, 35, p, 24. So p is ....
15. In the number sequence 7, 9, 13, 19, X, 37 Y, 63. The value of Y - X is ......