Mental Math
527+61
588
Estimate by rounding to the nearest 10:
1687+284=
830+160=990
9861+571=
10,432
1,234-924=
310
500-372
128
542-32
510
Estimate by rounding to the nearest 100:
67,753+1729
67,800+1700=68,500
The fourth grade class donated 8,029 boxes of fried onions, and 9,834 boxes of mashed potatos. How much did they donate in all?
17,863
84,724-28,342
56,382
6,000-2,423
3,577
813-768
45
Estimate to the nearest 10
5323-2611=
5320-2610=2710
67,829,823+519,848=
68,349,671
741,982-316,414=
425,568
802,320-527,513=
274,807
Miss Morrisey's class collected pencils for the community school supplies drive. Nick's group brought in 143 pencils and Mia's group added 78 more. How many pencils did the groups contribute all together?
221
Estimate to the nearest 100:
11,724-2,731
11,700-2,700=9,000
Jacob has read 58,230 books about dinosaurs. Leo has read 28,934 books about animals. How many books have they read all together?
87,164
Ellie and Addy raised $2,903,894 for student council in total. Ellie personally raised 1,009,342, how much did Addy raise?
1,894,552
Miss Morrisey won a shopping spree at target for $70,000. She has already spend $23,425 at the dollar spot. How much does she have left to spend?
46,575
8965-3624=
5341
This year 35,685 people ran in a marathon. Last year 8,683 fewer people ran. Rounding to the nearest 100, about how many people ran last year?
35,700-8,700=27,000
Miss Morrisey went to target and bought 20,198,374 christmas trees, 761,024,985 christmas lights. How many christmas items does she have in all?
781,223,359
Miss Morrisey bought 2,340,985,293 munchkins for the class. In the box there were glazed donuts, powdered sugar, pumpkin, and chocolate munchkins. 1,234,822 of those were regular glazed, 76,578,392 were powdered sugar, and 875,729,347 were pumpkin. How many were chocolate glazed?
1,387,442,732
$1,302,332