Let’s solve this step by step.
We are rounding numbers to
1 significant figure.
What does “1 significant figure” mean?
- The first non-zero digit is the only one we keep.
- All other digits become zeros (or we use scientific notation if needed).
- We round based on the next digit after the first significant figure.
Example:
→ 38 → first sig fig is 3, next digit is 8 → round up → 40
→ 0.056 → first sig fig is 5, next digit is 6 → round up → 0.06
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## Part 1: Round each number to 1 significant figure
We’ll go row by row.
Row 1:
1)
3186 → First sig fig = 3, next digit = 1 → less than 5 → stays 3 → so
3000
2)
92 → First sig fig = 9, next = 2 → less than 5 →
90
3)
21.71 → First sig fig = 2, next = 1 → less than 5 →
20
4)
3155 → First sig fig = 3, next = 1 → less than 5 → **3000
Parent Tip: Review the logic above to help your child master the concept of significant figures worksheet.
