Adding
23689 + 4879
28568
5265 - 2368
2897
97 x 3
291
About how much is 23 x 17?
400
Round to the ten thousands place
12,345
12,000
5874 + 3692
9566
8951 - 4875
4076
A shoe store has 95 pairs of shoes in each of its 7 rows of the store. How many shoes are in the store?
665 pairs of shoes
About how much is 39 x 53?
800
Round to the thousands place, then add.
4,623 + 23,023
27,000
85477 + 98777
184254
9333 - 5489
3484
23 x 54
1242
About how much is 210 x 30?
6000
2358 + 987
3345
20054+ 3698
23752
10000 - 5487
4153
98 x 78
7644
About how much is 275 x 93?
18000
7894 - 235
7659
9865 + 98744
108689
23000 - 5600
17400
What's the error?
A farmer planted 23 rows of black beans, with 15 beans in each row. He figured out that he needed 115 beans, but when he was planting, he discovered he didn't have enough beans. What was his error?
He only multiplied 23 x 5, instead of 23 x 15. He needed to multiply the tens place as well. He needed 345 beans.
About how much is 82 x 97?
8000
89 x 56
4984