Continue with Microsoft TeamsOntario Curriculum Expectation:
5.B2.3 use mental math strategies to multiply whole numbers by 0.1 and 0.01 and estimate sums and differences of decimal numbers up to hundredths, and explain the strategies used.
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1 of 101. Question
1. Round each number to the nearest whole. What is an appropriate estimate of the sum?
   1.9 + 3.8
CorrectIncorrect -
2 of 102. Question
2. Round each number to the nearest whole. What is an appropriate estimate of the sum?
   6.1 + 8.7
CorrectIncorrect -
3 of 103. Question
3. Round each number to the nearest whole. What is an appropriate estimate of the difference?
   10.3 − 5.1
CorrectIncorrect -
4 of 104. Question
4. Round each number to the nearest whole. What is an appropriate estimate of the difference?
   26.8 − 7.4
CorrectIncorrect -
5 of 105. Question
5. Round each number to the nearest whole. What is an appropriate estimate of the sum?
   15.6 + 13.3
CorrectIncorrect -
6 of 106. Question
6. Use benchmark decimal parts such as 0, 0.25, 0.5, or 0.75 to choose the appropriate estimate of the sum.
   10.26 + 6.49
CorrectIncorrect -
7 of 107. Question
7. Use benchmark decimal parts such as 0, 0.25, 0.50, or 0.75 to choose the appropriate estimate of the sum.
   4.25 + 7.23
CorrectIncorrect -
8 of 108. Question
8. Use benchmark decimal parts such as 0, 0.25, 0.50, or 0.75 to choose the appropriate estimate of the difference.
   15.19 − 8.01
CorrectIncorrect -
9 of 109. Question
9. Use benchmark decimal parts such as 0, 0.25, 0.50, or 0.75 to choose the appropriate estimate of the difference.
   21.68 − 13.52
CorrectIncorrect -
10 of 1010. Question
10. Use benchmark decimal parts such as 0, 0.25, 0.50, or 0.75 to choose the appropriate estimate of the sum.
   3.72 + 9.24
CorrectIncorrect
