Page 100 - Math Smart - 7

O Garth used 4.25 g of cheese to make a cheeseburger. Round the mass of cheese used to
one decimal place.
Find the digit in the place-value column you are rounding to. Underline this digit.
1
4.25
Look at the digit to the right of the underlined digit.
4.25
If the digit to the right is 5 or more, add 1 to the digit in the place-value column
you are rounding to. Drop all the digits to the right of the place-value column you
are rounding to.
cm
The digit is 5. So we add 1 to 5 and drop all digits to the right to round up.
4.25 g rounded to one decimal place is 4.3 grams.
O Garth used 4.21 g of cheese to make another cheese burger the next day.
Round the mass of cheese used to one decimal place.

Find the digit in the place-value column you are rounding to. Underline this digit.
4.21

Look at the digit to the right of the underlined digit:
4.21

If the digit to the right is 5 or more, add 1 to the digit in the place-value column
you are rounding to. Drop all digits to the right of the place-value column you are
rounding to.

The digit is 1 which is less than 5.
If the digit to the right is less than 5, add nothing to the place you
are rounding to. Drop all the digits to the right of the place you are rounding to.
The digit is 1, so we drop all digits to the right and round down.

4.21 g rounded to one decimal place is 4.2 g.

Check My

Understanding

O Complete the table.

Round to nearest
Decimal 10 ICQ 1000 whole number one decimal place

a) 1432.3
b) 645.5
c) 937.06
d) 787.19
e) 7847.9
f) 1009.99

Decimals