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Calculating with Significant Digits

Can you use your knowledge of the rules of significant digits to solve the problems below?
All addition, subtraction, multiplication, and division should (obviously) be rounded to significant digits
If you're confused about significant digits, refer to this website: https://www.splashlearn.com/math-vocabulary/significant-figures
Quiz by
AwesomeE
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Last updated: September 24, 2025
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First submittedSeptember 22, 2025
Times taken9
Average score60.0%
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Hint
Answer
How many significant digits are in the number 0.004205?
4
How many significant digits are in the number 450,000?
2
How many significant digits are in the number 450,000.?
6
How many significant digits are in the number 3.0700?
5
How many significant digits are in the number 7.30 × 10⁻³?
3
Round 85.7643 to 3 significant digits.
85.8
Round 0.0043891 to 2 significant digits.
0.0044
Round 123,456 to 4 significant digits.
123,500
Round 0.00098745 to 3 significant digits.
0.000987
Round 6.9999 to 2 significant digits.
7.0
Hint
Answer
Calculate: 34.56 + 7.891.
42.45
Calculate: 100.2 − 99.88.
0.3
Calculate: 1234 + 12.345 + 0.6789.
1247
Calculate: 450.0 − 0.00567.
450.0
Calculate: 89.3 + 1.25 + 7.001.
97.6
Calculate: 3.45 × 2.1.
7.2
Calculate: 0.00456 × 1234.
5.63
Calculate: 456 ÷ 7.89.
57.8
Calculate: (6.022 × 10²³) × (1.66 × 10⁻²⁴).
1.00
Calculate: (3.14159 × 2.718) ÷ 1.41
6.06
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2 Comments
Dimby
+2
Level 83
Sep 22, 2025
Nice one. I don't want to do the calculator ones, but the rest were fun. Also, 0.3 was given to me when I was trying to do 123,500 (I think), Also, "Round 123,456 to 4 significant digits" gives the answer 1,235, but the answer should be 123,500.
AwesomeE
+1
Level 60
Sep 24, 2025
Thanks for the comments! Should be fixed now!
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