Multiplication Strategies
Use a quick sketch to solve:
23 × 15
345
62 x 30 = (60 x 30) + ( ___ x 30)
62 x 30 = (60 x 30) + ( 2 x 30)
Nia is building a new house for her rabbit. The house is 19 feet by 11 feet. What is the area of the floor of the house?
209 square feet
49 ÷ 12
4R1
True or False
The 6 in the thousands place of 65,462 has a value 10 times greater than the 6 in the ones place.
False
60 times 10 does not equal 60,000.
Use a quick sketch to solve:
32 × 12
384
76 x 20 = (70 x 20) + ( ___ x 20)
76 x 20 = (70 x 20) + ( 6 x 20)
A pizza shop sells 14 pizzas each hour. If they sell pizza for 6 hours, how many pizzas will they sell in total? Then, if each pizza is cut into 8 slices, how many slices of pizza are there in total?
672 slices
47 ÷ 6.
7R5
Which of these numbers is composite?
11 17 23 32
Explain why.
32 is composite because (either)
32 is even and all even numbers are composite (besides 2)
32 has more factors that 1 and itself (4 x 8)
Use an area model to solve:
61 × 18
1,098
58 x 40 = (50 x 40) + ( 8 x ___ )
58 x 40 = (50 x 40) + ( 8 x 40)
There are 6 boxes of pencils. Each box contains 15 pencils. If the teacher wants to give 3 pencils to each student, how many students can she give pencils to?
30 students
53 ÷ 8?
6R5
List all of the factors of 48.
1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Use an area model to solve:
74 × 26
1,924
____ x 50 = (100 x 50) + ( 12 x 50)
112 x 50 = (100 x 50) + (12 x 50)
Clarence’s cupcake boxes have 6 cupcakes in each.
Clarence makes 12 cupcakes everyday. He is planning on selling his cupcakes in boxes. If he makes cupcakes for 4 days how many boxes does he make?
8 Boxes
A farmer has 42 chickens. If he puts 5 chickens in each pen, how many pens will he fill, and how many chickens will be left in the last pen?
8 R 2 so he will fill 8 pens and there will be 2 chickens will be in the last pen.
Jalen says there are 8 hundreds in 7,852. Jenny says there are 78 hundreds in 7,852. Their teacher says they're both right. How can that be so?
Jalen is right because there is an 8 in the hundreds place. Jenny is also right because there are 78 groups of 100 in the number 7,852.
Use a ratio table to solve:
42 × 11
462
___ x 15 = (10 x 15) + (8 x 15)
18 x 15 = (10 x 15) + (8 x 15)
Beatrice bought banana bread loaves for Clarence, Taki, Bertha and herself. She bought 25 loaves. If they want to split them up equally between all of them. How much banana bread do they each get?
They each get 5 loaves
They each get 6 1/2 loaves
They each get 6 1/4 loaves
Explain your answer!
6 1/4 loaves because 25 divided by 4 is 6 remainder 1 and you can split the remaining loaf into 4 pieces or 1/4.
A teacher has 46 pencils and wants to distribute them equally among 7 students. How many pencils will each student get, and how many pencils will be left over?
6 pencils with 4 leftover. She would drop the pencils and just give each student 6 pencils.
Lena has a box of pencils. It weighs 240 grams. Her friend Mia says, “Lena has three times the number of pencils that I do!” Which equations could represent this situation? (Note: m stands for the number of pencils Mia has.)
3 × m = 240
240 ÷ 3 = m
240 × 3 = m
m ÷ 3 = 240
3 × m = 240 and 240 ÷ 3 = m.