Estimating Sums and Differences

Flashcard
•
Mathematics
•
3rd Grade
•
Hard
Standards-aligned
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15 questions
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1.
FLASHCARD QUESTION
Front
What is estimation?
Back
Estimation is a way to find a number that is close enough to the right answer, usually with some thought about the numbers involved.
2.
FLASHCARD QUESTION
Front
How do you estimate a sum?
Back
To estimate a sum, round each number to the nearest ten or hundred, then add those rounded numbers.
3.
FLASHCARD QUESTION
Front
What is the difference between exact and estimated answers?
Back
Exact answers are the precise results of calculations, while estimated answers are close approximations.
4.
FLASHCARD QUESTION
Front
Why is estimating useful?
Back
Estimating helps us quickly check if an answer is reasonable and can save time in calculations.
5.
FLASHCARD QUESTION
Front
What is rounding?
Back
Rounding is changing a number to a nearby value that is easier to work with, often to the nearest ten or hundred.
Tags
CCSS.3.NBT.A.1
CCSS.4.NBT.A.3
6.
FLASHCARD QUESTION
Front
Estimate the sum of 47 and 36 by rounding.
Back
Round 47 to 50 and 36 to 40. The estimated sum is 50 + 40 = 90.
7.
FLASHCARD QUESTION
Front
Estimate the difference of 82 and 29 by rounding.
Back
Round 82 to 80 and 29 to 30. The estimated difference is 80 - 30 = 50.
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