Multiplication Strategies
Solve 7 x 8 using the double-double-double strategy
7 x 2 = 14...14 x 2 = 28...28 x 2 = 56
Eve, Cloe, and Ian are making an array. The array has an area of 36 square units. If one dimension is 9 units, what is the missing dimension?
4 units
Write a prime number and tell how you know it's prime
Prime numbers will vary.
It is prime because it only has two factors, itself and 1.
Write ALL the factors of the number 7
(1,7)
Write and solve a multiplication equation for this problem:
Grady bought a pair of pants. Nathan bought a pair of shoes. The shoes cost 3 times as much as the pants. The pants cost $15. How much did the shoes cost?
3 x 15 = $45
Incorrect if equation.
Incorrect if no dollar sign.
Maverick is solving the following problem. Help him solve:
200 x 40,000 = ?
8,000,000
Ava and Rose are creating an array. If the array has an area of 42 square units and one dimension is 7 units, what is the missing dimension?
6 units
Write a composite number and tell how you know it's composite.
Composite numbers will vary.
It is composite number because it has more than one factor pair.
Write three multiples for the number 9
Possible answers include: 9,18,27,36,45...
Emmy bought a CD. Brynn bought a book. The CD cost $14 and the book cost $7. How many more times than the book did the CD cost?
2 x 7 = 14
The CD cost 2 times as much as the book.
Incorrect if no equation
Marcella is practicing her multiplication strategies. Use the half-ten plus one strategy to solve:
16 x 6 = ?
16 x10 = 160
Half of 160 = 80
80+16 = 96
Using a number line, solve 7 x 4!
Work will vary
7 x 4 = 28
Is 29 a prime or composite number? Prove it.
It is prime. It's only factor pairs are 1 and itself
Write all the factors AND three multiples for the number: 50
Factors: (1,50), (2,25), (5,10)
Possible Multiples: 50,100,150,200,250,300...
Solve the story problem. Show your thinking with numbers, sketches, or words. Then write an equation that represents your work, with an answer that uses correct units:
Manuella, Logan, Liam, and Cassius sit at a table. Each of the 4 students at the red table has 8 markers. The class has 5 times as many markers as the entire red table. How many markers total does the whole class have?
Work will vary.
(8 x 4) x 5 = 160
160 markers
Kellan is trying to solve the problem. Use the tens minus one strategy to solve:
83 x 9 = ____
83 x 10 = 830
830 - 83 = 747
Ms. Markelon will draw a ratio table on the board. Copy and complete the ratio table to find the missing answer.
See ratio table
Is 39 prime or composite? Prove it.
39 is composite.
It has factor pairs of (1 and 39)and ( 3 and 13)
Write ALL the factors of the number 48
(1,48), (2,24), (3,16), (4,12), (6,8)
Incorrect if missing a factor pair!
Solve the story problem. Show your thinking with numbers, sketches, or words. Then write an equation that represents your work, with an answer that uses correct units:
Maggie and Eddie saw 3 rows of crayons in her 24-count crayon box. How many crayons are in each row?
Work will vary.
24 / 3 = 8
8 crayons in each row.
Nate is solving the problem below. Use the double double strategy to solve:
87 x 4 = ?
87 x 2 = 174
174 x 2 = 348
87 x 4 = 348
Use a ratio table, area model, or number line to solve:
17 x 7 =
Standard algorithm does not count.
17 x 7 = 119
True of False: All even numbers are composite.
False: 2 is the only even number that is prime.
Challenge: What are common multiples of 2 and 3?
Some possible answers: 5,12,18,24,30
Solve the story problem. Show your thinking with numbers, sketches, or words. Then write an equation that represents your work, with an answer that uses correct units:
The green table has 5 students and each student brought 6 folders. The red table has 6 students and each student brought 8 folders. How many folders do both groups have together?
Work will vary.
(5x6) + (6x8) = 78 folders
30 + 48 = 78 folders