Use Partial Products
13 x 3
9 (3 x 3)
30 (3 x 10)
9 + 30 = 39
32 x 2
64
11 x 9
(10 + 1) x 9
(10 x 9) + (1 x 9)
90 + 9 = 99
58 x 9
522
Hillary's mom ordered 375 cupcakes. Each cost $3. She also ordered $125 in cookies. How much money did she spend on desserts?
$1,250
46 x 2
12 (2 x 6)
80 (2 x 40)
12 + 80 = 92
27 x 8
216
32 x 4
(30 + 2) x 4
(30 x 4) + (2 x 4)
120 + 8 = 128
72 x 6
432
Mrs. Batter brews 38 pots of coffee each week. Each pot uses 8 scoops of coffee beans. How many scoops of coffee beans does Mrs. Batter use in 9 weeks?
2,736 scoops
71 x 12
2 (2 x 1)
140 (2 x 70)
10 (10 x 1)
700 (10 x 70)
2 + 140 + 10 + 700 = 852
13 x 59
767
12 x 15
12 x (10 + 5)
(12 x 10) + (12 x 5)
120 + 60 = 180
1,240 x 7
8,680
Harlow's dad bought 8 dozen chocolate donuts and 5 dozen glazed donuts for breakfast for Harlow and her friends. How many donuts did her dad buy?
Hint: 1 dozen = 12 donuts
156 donuts
111 x 5
5 (5 x 1)
50 (5 x 10)
500 (5 x 100)
5 + 50 + 500 = 555
544 x 5
2720
8 x 43
8 x (40 +3)
(8 x 40) + (8 x 3)
320 + 24 = 344
18 x 54
972
Mr. Batter made 16 sheets of chocolate chips each day for four days. Each sheet had 12 cookies on it. How many cookies did Mr. Batter make over the four days?
768 cookies
33 x 44
12 (4 x 3)
120 (4 x 30)
120 (40 x 3)
1,200 (40 x 30)
12 + 120 + 120 + 1,200 = 1,452
1,256 x 9
11,304
157 x 20
(150 + 7) x 20
(150 x 20) + (7 x 20)
3,000 + 140 = 3,140
381 x 24
9,144
What is a second method to find the answer to the above question?
16 x 12 = 192
192 x 4 = 768 cookies
OR
16 x 4 = 64
64 x 12 = 768 cookies