Learning pack · IGCSE handout

Rounding

What's in this pack: printable worksheet PDF, matching answers PDF (IGCSE / Secure–Stretch practice). Rounding and estimation control accuracy. Significant figures and decimal places are not the same — read the question.

Resources at the top · full summary · videos with short notes below.

🎒 Resources in this pack

Jump straight to the printable files, or scroll to the summary and videos.

Scaffolded Learning Sheet — attempt the worksheet, then use the Answers for a full written solution.

📝 Open Learning Sheet ✅ Open answers 🎬 More topic videos (6)📖 Full summary

Files: 13_rounding_handout.pdf · 13_rounding_handout_answers.pdf

Full topic summary

Rounding and estimation control accuracy. Significant figures and decimal places are not the same — read the question.

Key learning points

Decimal places: count digits after the point.
Significant figures: count from the first non-zero digit.
Estimation: round to 1 s.f. then calculate.

Worked example 1 — Decimal places

Round $7.846$ to 1 decimal place.

Working

7.8

Look at the second decimal digit (4).

Worked example 2 — Significant figures

Round $0.004582$ to 2 significant figures.

Working

0.0046

Count from the first non-zero digit.

Worked example 3 — Estimation

Estimate $48.2\times19.6$ by rounding to 1 s.f.

Working

50\times20=1000

1 s.f. estimation checks calculator answers.

🎬 Topic videos

Math Antics - Integer Multiplication & Division
Math Antics · 10 min
Lower Secondary classroom-friendly explainer. Scaffold→stretch friendly; use with mixed-ability groups.
Introduction to Integers
Eddie Woo · 5 min
Lower Secondary classroom-friendly explainer. Scaffold→stretch friendly; use with mixed-ability groups.
Adding and Subtracting Integers (Applying operations to integers and visualising with Number line)
Eddie Woo · 12 min
Lower Secondary classroom-friendly explainer. Scaffold→stretch friendly; use with mixed-ability groups.
Subtracting with integer chips | Integers: Addition and subtraction | 7th grade | Khan Academy
Khan Academy · 6 min
Lower Secondary classroom-friendly explainer. Scaffold→stretch friendly; use with mixed-ability groups.
Adding with integer chips | Integers: Addition and subtraction | 7th grade | Khan Academy
Khan Academy · 4 min
Lower Secondary classroom-friendly explainer. Scaffold→stretch friendly; use with mixed-ability groups.
Adding and Subtracting Negative Numbers
Maths Genie · 9 min
Lower Secondary classroom-friendly explainer. Scaffold→stretch friendly; use with mixed-ability groups.

More Lower Secondary packs

Browse the hub Learning Packs & Summary, or open the compact Rounding summary.