Level 2 PSLE The sum of two numbers is 100. One of the numbers is a multiple of 9. The other number is a factor of 20. What is the difference between the 2 numbers?
Number 1 + Number 2 = 100
Number 1 is a factor of 20.
Factors of 20: 1, 2, 4, 5, 10, 20
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? |
20 |
100 - 20 = 80 |
80 ÷ 9 = 8 r 8 |
x |
10 |
100 - 10 = 90 |
90 ÷ 9 = 10 r 0 |
✓ |
Difference between the 2 numbers
= 90 - 10
= 80
Answer(s): 80