Estimate Sums/Differences
Round to the nearest hundred to estimate the difference.
901 - 321 =
600
6 8 9
+ 1 2 4
813
A television costs $326. A new speaker costs $229. How much does the television and speaker cost altogether?
$555
8 3 5
- 2 2 4
611
A winter parka costs $267. A customer pays $159 for the winter parka after using a gift card. How much money is the gift card worth?
$108
Round to the nearest hundred to estimate the sum.
981 + 762 =
1,800
584
+ 157
741
Newton needs to write a 500-word essay. He writes 438 words during class. He finishes his essay by writing 56 words at home. Does Newton's essay have enough words?
No, he only has 494 words.
494
− 149
345
Newton wants to buy a dog house that costs $347. He saves $136 each month for 2 months. How much money does he still need to save?
$75 more
Round to the nearest ten to estimate the sum.
354 + 212 =
560
44
26
40
+ 730
840
A photo album holds 400 pictures. You have 218 digital pictures on a digital camera and 184 pictures on a tablet. Can the photo album hold all of your pictures? Explain.
No, you have 402 photos.
837
− 380
457
The Big Ben Clock Tower has 334 steps. A visitor climbs 176 steps, takes a break, and then climbs 85 more steps. How many more steps does the visitor still need to climb to reach the top of the tower?
73 more steps
Round to the nearest ten to estimate the difference.
731 - 424
310
1, 2 4 5
+ 3, 5 7 4
4 , 8 1 9
A principal buys a tote bag for each of the first grade, second grade, and third grade students. Tote bags come in boxes of 10. How many boxes does the principal buy?
1st: 121 students
2nd: 117 students
3rd: 112 students
35 boxes
Find the missing digits.
_ 5 9
− 2 7 _
6 8 3
9 5 9
− 2 7 6
6 8 3
Newton and Descartes buy a canoe together for $787. Newton pays $352. Descartes pays $196 for the rest of the cost after using a gift card. How much money is Descartes's gift card worth?
$239
Find an ESTIMATE two different ways:
978 - 856 =
tens: 120
hundreds: 100
1, 8 9 9
1, 2 4 3
+ 2, 7 9 9
5 , 9 4 1
There are 950 runners at a marathon race. The marathon sponsor brings 846
water bottles. The runners’ club brings 9 packages of water bottles. Each
package has 9 water bottles. How many more water bottles are needed for
each runner to get one?
23 more water bottles
5 0 6
- 3 5 7
149
On Thursday, 384 people went to see a movie. On Friday, 910 people went to see the movie. On Saturday, 481 people went to see the movie. How many more people went to see the movie on Friday than on Thursday and Saturday combined?
45 more people