Level 2 PSLE The sum of two numbers is 77. One of the numbers is a multiple of 9. The other number is a factor of 25. What is the difference between the 2 numbers?
Number 1 + Number 2 = 77
Number 1 is a factor of 25.
Factors of 25: 1, 5, 25
Number 2 is a multiple of 9.
To be a multiple of 9, Number 2 must have no remainder when divided by 9.
Number 1 |
Number 2 |
Is Number 2 is a multiple of 9? |
Is the remainder 0? |
25 |
77 - 25 = 52 |
52 ÷ 9 = 5 r 7 |
x |
5 |
77 - 5 = 72 |
72 ÷ 9 = 8 r 0 |
✓ |
Difference between the 2 numbers
= 72 - 5
= 67
Answer(s): 67