This deep dive covers Types of Rounding within Rounding & Estimation for GCSE Mathematics. Revise Rounding & Estimation in Number for GCSE Mathematics with 13 exam-style questions and 6 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 3 of 6 in this topic. Use this deep dive to connect the idea to the wider topic before moving on to questions and flashcards.
Types of Rounding
| Type | What It Means | Example: 3.847 |
|---|---|---|
| 1 d.p. | 1 digit after decimal point | 3.8 (look at 4, round down) |
| 2 d.p. | 2 digits after decimal point | 3.85 (look at 7, round up) |
| 1 s.f. | 1 significant figure | 4 (from first non-zero) |
| 2 s.f. | 2 significant figures | 3.8 |
Practice questions for Rounding & Estimation
Round 4.673 to 1 decimal place.
A student says '3.50 and 3.5 are exactly the same number so they have the same number of significant figures.' Explain why the student is wrong.
Quick recall flashcards
Estimation
Round each number to 1 s.f., then calculate
Rounding Rule
Look at the next digit: 0-4 round down, 5-9 round up