Addition with regrouping
436+47
483
231-23
208
round 229 to the nearest ten
230
estimate by rounding the the nearest ten.
331-52
280
Steven read 72 pages on Sunday and 83 pages on Monday. About how many pages did Stephanie read during the two days?
150
792+549
1,341
587-39
548
round 4,753 to the nearest thousand
5,000
estimate by rounding to the nearest hundred
725+37
770
Maddie biked 345 miles last month. This month she has biked 107 miles. Altogether, about how many miles has Maddie biked last month and this month?
460
6,587+3,495
10,082
828-429
399
round 581 to the nearest hundred
600
estimate by rounding to the nearest hundred
993-342
700
Jen has $236. Dan has $289. Do Jen and Dan have more than $600 in all? Estimate and solve.
No, they have less than 600.
$530
8,999+5,778
14,777
9,832-3,764
6,068
round 7,654 to the nearest thousand
8,000
estimate by rounding to the nearest hundred 834+95
900
A theater sells $408 tickets. Two hundred seventy-three people arrive. About how many more people are expected to arrive?
About 125 people.
400-275
12,789+28,978
41,776
28,687-19,847
8,840
round 52,897 to the nearest ten thousand
50,000
estimate by rounding to the nearest thousand
7,983+4,678
13,000
One week Mrs. Smith earned $486, and the next week she earned $254. If Mrs. Smith's goal was to earn $545, by about how much did she exceed her goal? Show how you used estimation to find your answer.
$500+$250=$750
She earned about $750 in two weeks; $750-$550=$200.
She earned about $200 extra.