Estimate
Area Model
Partial Products
Solve
100
Estimate the product.
3 x 102 = ?
3 x 100 = 300
100
Use this area model to multiply.
34 x 6 = 204
100
What are the partial products for 3 x 17?
30 + 21
100
20 x 70 = ?
1,400
200
Estimate the product.
249 x 4 = ?
250 x 4= 1,000
200
Use this area model to solve the multiplication problem.
24 x 23 = 552
200
What are the partial products?
3 x 432 = ?
1,200 + 90 + 6
200
123 x 3 = ?
369
300
Use compatible numbers to estimate.
24 x 11
25 x 10 = 250
300
Susie is plants carrots. She has 13 rows with 15 carrots in each row. How many carrots plants are there?
100 + 50 + 30 + 15 = 195 carrots
300
What are the partial products of 11 x 48?
400 + 80 + 40 + 8
300
1, 346 x 5 = ?
6,730
400
Estimate the product
42 x 92 = ?
40 x 90 = 3,600
400
Draw an area model to solve 12 x 33.
400
What are the partial products for 25 x 67?
1,200 + 140 + 300 + 35
400
42 x 40 = ?
1,680
500
Which estimate is closer to the exact answer?
14 x 32
15 x 30 or 10 x 30?
15 x 30 = 450
10 x 30 = 300
14 x 32 = 448, so 15 x 30 is the better estimate
500
Which blanket is bigger?
Mrs. Slater's blanket: 64 inches long x 50 inches wide
Ms. Boudrot's blanket: 59 inches long x 70 inches wide
Mrs. Slater's blanket is 64 x 50 = 3, 200 inches
Ms. Boudrot's blanket is 59 x 70 = 4,130 inches wide
4,130 > 3, 200, so Ms. Boudrot's blanket is bigger.
500
32 x 80
(3 x 80) + (2 x 80) = 240 + 160 = 400
What's the mistake?
(30 x 80) + (2 x 80) = 2,400 + 160 = 2,560
500
45 x 82
3,690