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