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1.06 Calculations with decimals

Lesson

Using a calculator with decimals

The decimal point button looks like a full stop key. You enter the decimal just as it is written on the page.

For example the number $1.35$1.35, you would enter:

$\editable{1}$1 $\editable{.}$. $\editable{3}$3 $\editable{5}$5

 

Practice questions

Question 1

Consider $11.59\div4.44$11.59÷​4.44

  1. Estimate the answer by rounding both values to the nearest whole number.

  2. Use a calculator to evaluate $11.59\div4.44$11.59÷​4.44 and write the answer below. Give your answer to two decimal places.

  3. What is the difference between the estimate and the actual answer?

Question 2

Consider $7.38\times8.12$7.38×8.12

  1. Estimate the answer by rounding both values to the nearest whole number.

  2. Use a calculator to evaluate $7.38\times8.12$7.38×8.12 and write the answer below. Give the complete decimal answer.

  3. What is the difference between the estimate and the actual answer?

Question 3

Evaluate $\frac{0.323}{0.019}$0.3230.019

Outcomes

F.1

solve practical problems requiring basic number operations

F.2

apply arithmetic operations according to their correct order

F.5

use a calculator for multi-step calculations

F.6

check results of calculations for accuracy

F.8

evaluate decimal fractions to the required number of decimal places

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