Page 101 - Math Smart - 7

© Ben is confused about rounding decimals. Help Ben by completing the table.

a) 10.34 rounded to
one decimal place
b) 129.1 rounded
is 10.3.
to the nearest 10
is 13.

c) When the digit to
the right of the place value
rounded
am rounding it to is less than 5,
one
I add 1 to the digit in the place
value I am rounding it to.

Ben's statement Correct / Incorrect Reasoning
a) Correct The digit in the hundredths column is less than 5.
Add nothing to the digit in the tenths column and
drop all the digits to right.
b)
c)

d)

© Round the following measurements,

a) 4.32 £ to the nearest litre, b) 16.55 s to one decimal place.
c) 23.96 s to one decimal place, d) 2432 ml to the nearest litre.
e) 542 cm to the nearest metre, f) 6709 m to the nearest kilometre.
g) 4450 g to the nearest kilogram. h)* Challenge! 4.682 kg to the nearest 100 grams.

O Read the measurements. Round each measurement and fill in the blanks.
a) A table has a length of 2.28 m. The length of the table rounded to the nearest
whole metre is .
b) An envelope has a width of 176 mm. The width of the envelope to the nearest
10 mm is .
c) A tea pot is filled with 378 ml of tea. The volume of tea in the pot is filled to the
nearest 100 ml is .
d) A kitchen scale reads a mass of 589 g. The mass shown on the scale to the nearest
10 g is .
e)* Challenge! The time on a clock is 6:39 a.m. The time to the nearest hour is .
f)* Challenge! The temperature reading on a thermometer is 94. 9°C. The temperature on the
thermometer rounded to the nearest 10®C is .