Addition
21 + 9
30
19 - 7 =
12
Estimate by the TENS place. Then add.
89 + 11 =
90 + 10 = 100
10 x 4 =
40
If Allison gave made 25 goody bags for her birthday, but she only gave out 17, how many goody bags were left over?
25 - 17 = 8 goody bags
182 + 34 =
216
56 - 23 =
33
Estimate by the TENS place. Then subtract.
982 - 343 =
980 - 340 = 640
8 x 200 =
1,600
Jordi wanted to go to the movies with his friend Maykel. The movie tickets cost $13 each. How much money would they need to see the movie?
13 x 2 = $26
549 + 112 =
661
196 - 116
Estimate these numbers by the TENS place. Then add.
114 + 459 =
110 + 460 = 570
9 x 7,000
63,000
Aline and Isabella talked on the phone for 320 minutes yesterday, and 681 minutes today. How many minutes did they talk all together?
320 + 681 = 1,001 minutes
3,652 + 562 =
4,214
459 - 368
91
Estimate by the HUNDREDS place. Then add.
1,801 + 1,221
1,800 + 1,200 = 3,000
60 x 60 =
3,600
Marilyn and her brother walked 2,000 steps every school day this week. That means for 5 days they walked 2,000 steps. How many steps did they walk by Friday?
2,000 x 5 = 10,000 steps
43,120 + 120 =
43, 240
4,000 - 3,490 =
510
Estimate by the GREATEST place. Then subtract.
5,670 - 3,340 =
5,000 - 3,000 = 2,000
What is the answer to a multiplication problem called?
A product
Keisy spent 3,204 minutes drawing yesterday. She spend 2,489 minutes drawing today. Estimate how many minutes Keisy spent drawing all together by rounding to the HUNDREDS place.
3,200 + 2,500 = 5,700 minutes