Level 2 PSLE The sum of two numbers is 99. One of the numbers is a multiple of 10. The other number is a factor of 18. What is the difference between the 2 numbers?
Number 1 + Number 2 = 99
Number 1 is a factor of 18.
Factors of 18: 1, 2, 3, 6, 9, 18
Number 2 is a multiple of 10.
To be a multiple of 10, Number 2 must have no remainder when divided by 10.
Number 1 |
Number 2 |
Is Number 2 is a multiple of 10? |
Is the remainder 0? |
18 |
99 - 18 = 81 |
81 ÷ 10 = 8 r 1 |
x |
9 |
99 - 9 = 90 |
90 ÷ 10 = 9 r 0 |
✓ |
Difference between the 2 numbers
= 90 - 9
= 81
Answer(s): 81