calculator

Everyday

1. A calculator is a small electronic machine for doing sums and other maths quickly. tree →
2. A calculator can also be a computer program or phone app that does the same thing. tree →

In the lessons

In maths lessons pupils use calculators for big or hard sums and to check answers, but must also learn mental and written methods; in some tests calculators are not allowed. A sensible estimate first helps you spot when you pressed a wrong key. Phrases: «calculator allowed», «use a calculator to check».

Examples

• Use a calculator to check your answer. tree →
• Calculators are not allowed in this test. tree →
• I typed 25 × 4 into the calculator and got 100. tree →
• My phone has a calculator app. tree →
• Estimate first, then use the calculator. tree →
• The calculator needs a new battery. tree →

Note

Countable. Spelled «calcul-ator» (ends in -or). Verb: calculate; noun: calculation. Trap: a calculator only gives the right answer if you type the right numbers and the right operation, so think about whether the answer makes sense.