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Maths•Mental Maths & Speed Strategies

Quick Calculation Tricks

Upper Primary 8 questions
AI-drafted from platform data — specialist review scheduledBy DigiTransact Mastermind editorial teamLast updated
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What quick calculation tricks means

You learn to make sums and multiplication faster in your head by changing numbers into friendlier ones. This helps you work neatly in tests and saves time when checking answers.

What you will practise

  • Round numbers to the nearest ten before adding.
  • Use compensation to adjust the answer after rounding.
  • Break multiplication into easier facts you know.
  • Double one number, then add or subtract a small amount.
  • Use number bonds to spot quick mental steps.

Before you start

You should already know addition and multiplication facts up to at least 10 times tables. You should also be comfortable with place value and simple rounding to the nearest ten.

Worked example

One question from this skill's own question bank, shown with its full working.

Question

Use rounding to find 99 + 47 quickly.

  • 145
  • 146
  • 147
  • 148
Answer: 146

Working: Think 100 + 47 = 147, then subtract 1 → 146.

Common mistakes to avoid

  • Rounding both numbers and forgetting to adjust back to the exact answer.
  • Using compensation the wrong way round and adding when you should subtract.
  • Breaking numbers into parts but losing one part in the middle of the sum.
  • Skipping basic facts you do not know well, which slows down your mental method.

Curriculum and exam alignment

Ghana GES Basic 4 to 6 syllabusGroundwork for the BECE

This kind of work usually appears in Upper Primary mathematics as part of mental computation and number sense. It supports school-based assessment and builds the quick thinking needed for later BECE preparation.

Curriculum notes are a general guide to where this work normally sits. Always check the syllabus your school or examination body is currently using.

Related skills

Other Mental Maths & Speed Strategies skills in Maths, at the same point in the course.

Other Maths topics

Counting with PicturesPicture Addition & SubtractionEarly NumeracyNumber BasicsSHS Core MathematicsUniversity Mathematics

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Exams that assess quick calculation tricks

Upper Primary work on this skill feeds directly into these exam papers. Each page lists the Maths topics that appear on it.

GESGES practice questionsFree GES practice across the subjects at this stage, with worked answers.BECEBECE practice questionsListed as a related subject on the BECE practice page.WASSCEWASSCE practice questionsListed as a related subject on the WASSCE practice page.

How this page was produced

This text was drafted with AI assistance from the questions and topics already stored on the platform. A subject-specialist review is scheduled but has not yet been recorded, so we do not claim it here.

Written by
DigiTransact Mastermind editorial team
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8 questions with a worked answer after every attempt, and a SmartScore that tracks how close you are to mastery.

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