Level 1
When rounding to the nearest ten, look at the ones digit.
If the digit is below 5 (0, 1, 2, 3 or 4) we round down.
If the digit is 5 or higher (5, 6, 7, 8 or 9) we round up.
Have a look at how the numbers below have been rounded up and down:
21 - Round down to 20
42 - Round down to 40
53 - Round down to 50
74 - Round down to 70
35 - Round up to 40
16 - Round up to 20
97 - Round up to 100
Let's practise estimating the product.
Question
Round each factor to the nearest ten, then multiply.
57 x 14
Solution
Round each number to the nearest ten.
57: round to 60
14: round to 10
Now multiply 60 x 10 = 600
The answer is 600.
