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Estimating — round every number first

Estimation

An estimation question that practises rounding every number sensibly before multiplying and dividing.

Challenge level
Exam standard
01
Have a go first

The Question

Estimate 4987 × 0.0203 ÷ 19.6. Show the rounded numbers you used.

02
Then check together

The Answer

Reveal the Answer
About 5

Round every number to something you can hold in your head: 5000 × 0.02 ÷ 20. 5000 × 0.02 = 100, and 100 ÷ 20 = 5. The skill is choosing numbers that are easy to multiply and divide — not getting close to the exact answer.

Now watch the solution

Estimating — round every number first
Singapore Maths Academy
video cover image
Pencil and paper

Practice Sheet + Marked Answers

The four-question practice sheet, the solutions in our teaching voice and a self-marking quiz for this question are part of The Question Desk course — every school day of the term, with progress you can see. Enrolled group students get it included.

Want a Plan Built Around Your Child, Not Just This Week’s Question?

Small groups of around 4–5 (max 8), matched to your child’s year group and pace. Start with the free baseline assessment and we’ll tell you exactly where they are.