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