II.6 Estimate differences by rounding up to 1,000
Which subtraction problem has a difference of about 90?
Which subtraction problem has a difference of about 200?
Which subtraction problem has a difference of about 500?
Estimate the total by rounding each number to the nearest ten first, then subtract.
82 − 21
The difference is about .
Estimate the total by rounding each number to the nearest hundred first, then subtract.
531 − 298
645 − 312
728 − 381
693 − 352
Which subtraction problem has a difference of about 60?
74 − 33
Which subtraction problem has a difference of about 40?
782 − 249
Which subtraction problem has a difference of about 300?
96 − 17
874 − 421
65 − 24
88 − 41
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