Starter quiz
- Significant figures are the digits in a number that contribute to the ______ of the number.
- 'accuracy' ✓
- Select all the numbers which have 6 as the first significant figure.
- 46
- 68 ✓
- 606 ✓
- 46 266
- 600 606 ✓
-
- In the number 45 026, in which column is the first significant figure?
- tens
- hundreds
- thousands
- ten thousands ✓
- hundred thousands
-
- Match each number to its value when it is rounded to one significant figure.
- 356 268⇔four hundred thousand ✓
- 42.689⇔forty ✓
- 449.09⇔four hundred ✓
- 3 591 054⇔four million ✓
- 3560⇔four thousand ✓
- Round 85 026 to one significant figure.
- '90 000' ✓
- What value could the missing digit be in 5 265 = 50 000 (to 1 s.f.)?
- 7
- 6
- 5
- 4 ✓
- 3 ✓
-
Exit quiz
- In the number 50 872, the 8 is the ______ significant figure.
- 'third' ✓
- Select all the numbers which have 7 as the third significant figure.
- 507 ✓
- 827.04 ✓
- 12 076.59
- 507 365 ✓
- 8 005 729
-
- Select all the numbers which have zeros that are not needed to preserve the place value of other digits.
- 60.006
- 6006.06
- 60 660.0600 ✓
- 66 000
- 606 606.66000 ✓
-
- Match each number to the correct statement.
- 5094⇔4 is the fourth significant figure ✓
- 50 904⇔4 is the fifth significant figure ✓
- 509 004⇔4 is the sixth significant figure ✓
- 954 000⇔4 is the third significant figure ✓
- 4 050 090⇔4 is the first significant figure ✓
- Round 50 904 to 2 significant figures.
- '51 000' ✓
- Round 40 956.644 to 3 significant figures.
- '41 000' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The first non-zero digit of a number is the first significant figure.
- Once the first significant figure is identified you can find any significant figure.
- It is important to know when zeros are and are not significant when rounding integers.
- Integers can be rounded to any number of significant figures.
Common misconception
Assuming all zero digits are not significant.
Designing questions that contain zero digits in a variety of positions.
Keywords
Significant figures - Significant figures are the digits in a number that contribute to the accuracy of the number. The first significant figure is the first non-zero digit.
Round - To change a number into another number that is approximately the same value but is easier to work with. E.g. round 561 to the nearest 10 is 560.
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