Rounding integers to significant figures | Maths | Quizalize & Oak National Academy

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 $\square$ 265 = 50 000 (to 1 s.f.)?
- 7
- 6
- 5
- 4 ✓
- 3 ✓

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' ✓

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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.

Assuming all zero digits are not significant.

Designing questions that contain zero digits in a variety of positions.

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.