Express 6.45 as a mixed number in its simplest form.
- 645100
- 6920
- 6910
- 645
Need a hint?
Write the decimal part over 100 first, then look for a common factor of the numerator and denominator.
Worked answer
- 0.45 means 45 hundredths, so 0.45 = 45/100.
- Divide top and bottom by 5: 45/100 = 9/20.
- So 6.45 = 6 9/20.
The mistake this question tests
Simplest form in final fraction answers
Some pupils write 0.45 as 45100 and stop without simplifying. Others divide only the top by 5 and the bottom by 10, getting 910.
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