Math test
1. Find HCF using prime factors:
a.​ 460, 520,495
b.​ 672 , 960, 390
2. The length of an iron sheet and a copper sheet is 2666 cm and 9699 cm respectively. What will
be the length of the highest piece of equal size cut from the two sheets? Determine the number of
pieces of sheets.
3. Fill in the blank digit to make the number divisible by:
(i) by 5 : 7164__, 32197__
(ii) by 3 : 1__43, 47__05, __316
(iii) by 6 : __428, 9__52, 721__
(iv) by 4 : 2462__, 91__ __, 670__
(v) by 9 : 1232__, 59__16, 4642__
4. The length of a silver tile is 150 cm and the length of a black tile is 220 cm. What is the smallest
length that can be exactly covered using both types of tiles without cutting any of them?
Determine the number of tiles.
5. Determine the prime numbers from 85 to 150
6. Express in words
(i)the greatest number using the following digits.
(ii)the difference between greatest and smallest number using the following digits. Also,
determine if it is divisible by 6 and 9.
6, 8, 1, 0, 9, 5, 4, 2.
7. Find the smallest number of 7 digits which is divisible by 8
8. Find the greatest number of 4-digits which on being divided by 9,12, 24 and 40 leaves 3, 6, 18
and 36 as remainders respectively.
9. There are 88 students in Section A and 132 students in Section B of a class. The school wants
to buy the minimum number of books for their shared library so that the books can be equally
distributed among either section without leaving any book behind.
What is the smallest number of books the school should buy?
10. In a busy city, three traffic signals at different intersections turn red at intervals of 80 seconds,
90 seconds, 115 and 120 seconds. If all three signals turn red at the same time now, after how
many seconds will they turn red together again?