Rule of Zeros
10 x 10
100
9 x 6
54
How many boxes are in a 2 x 2 area model problem?
4
Estimate 4 x 12.
4 x 10 = 40
Neil wants to put 1-foot square tiles in his kitchen. The floor is rectangle. It is 40 feet long by 20 feet wide. How many square tiles does Neil need?
800 square tiles
60 x 3
180
8 x 7
56
Draw an area model for 8 x 93. Solve.
744
Estimate 43 X 37.
40 x 40 = 1,600
A school sweatshirt costs $7. If the principal orders 237 sweatshirts, how much will the order cost?
$1,659
90 x 50
4,500
9 x 9
81
Draw an area model for 40 x 66. Solve.
264
Estimate 5 x 498.
5 x 500 = 2,500
Mrs. Johnson bought 10 items at the grocery store. She bought 2 boxes of cereal for $6 each and 3 turkeys for $42 each. She paid $9 for her favorite apples. How much did the cereal and turkeys cost?
List any extra numerical information.
$138
Extra = apples
900 x 30
27,000
8 x 6
48
Draw an area model for 3 x 987. Solve.
2,961
Estimate 4 x 7,296.
4 x 7,000 = 2,800
There are 18 Sharpies in a box. If there are 80 boxes, how many Sharpies are there in all?
1,440 Sharpies
800 x 700
560,000
9 x 8 x 1
72
Draw an area model for 3,671 x 4. Solve.
14,684
Estimate 49 x 5,798.
50 x 6,000 = 300,000
Mr. Johnson bought 13 bags of blue Legos with 30 Legos in each bag. He bought 23 bags of green Legos with 25 in each bag. What is the difference in the number of blue and green Legos?
185 Legos