Assessing the Reasonableness of Subtraction Using Rounding

Interactive Video
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Mathematics
•
1st - 6th Grade
•
Hard
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5 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is one method to check if a subtraction answer is reasonable?
Compare the answer to a similar problem.
Recalculate the problem using a calculator.
Ask a friend for their opinion.
Use rounding to estimate the answer.
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Dana's problem, to which place value are the numbers rounded?
Thousands
Hundreds
Units
Tens
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why was Dana's answer considered reasonable?
It was a little higher than the estimated answer.
It was very close to the estimated answer.
It was a little lower than the estimated answer.
It was exactly the same as the estimated answer.
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In Larry's problem, to which place value are the numbers rounded?
Hundreds
Units
Thousands
Ten thousands
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why was Larry's answer not considered reasonable?
It was too close to the original number.
It was a little lower than the estimated answer.
It was off by more than the subtrahend.
It was exactly the same as the estimated answer.
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