Life Skills · Topic 76 of 117
Using a Calculator
⭐ MasteredA calculator can help you solve maths problems quickly, but you still need to understand the steps. Check your answers by estimating or doing the sum in your head.
💡 Fun fact
The first handheld electronic calculators appeared in the early 1970s.
All about Using a Calculator
A calculator can help you solve maths problems quickly, but you still need to understand the steps. Type in the numbers carefully and check the display before pressing equals. Using a calculator well includes knowing when an answer is likely to be wrong.
Estimating before you calculate helps you spot mistakes. If you multiply 19 by 21, an estimate of 20 times 20 tells you the answer should be around 400, not 40.
🎮 Try it yourself!
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