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Key Stage 3 Number
Powers, Roots and Accuracy
Use powers, roots, reciprocals, rounding and estimation to check answers.
Key idea
Choose a representation first, then calculate carefully and check whether the answer is reasonable.
What you will learn
Use powers confidently.
Use roots confidently.
Use rounding confidently.
Use estimation confidently.
Success checklist
✓I can explain what powers, roots and accuracy means.
✓I can choose a suitable method without being told.
✓I can show clear working and check my answer.
Worked example
Simplify 1824.
Step 1
Find a common factor of 18 and 24.
Step 2
Both numbers divide by 6.
Step 3
1824 = 34.
Answer
34
Quick practice
Question 1
Simplify 1525.
Question 2
Round 3.746 to 2 decimal places.
Question 3
Write 4,800 in standard form.
Related resources
These are linked to the wider Number topic for now.