Estimation Station
Round each number to the tens place. Then, multiply to estimate.
53
X 8
______
50 x 10= 500
Solve:
48 x 2 =
96
8 x 0= 0
Word Bank: Commutative, Associative, Identity, Zero, Distributive
Zero Property
What is the answer to a multiplication problem called?
product
Round each number to the tens place. Then, multiply to estimate.
49
X 12
______
50 x 10 = 500
431 x 5 =
2,155
3 x 1 = 3
Word Bank: Commutative, Associative, Identity, Zero, Distributive
Identity Property
What is the name for the numbers getting multiplied together?
factors
Round the first number to the hundreds place and the second number to the tens place. Then, multiply to estimate..
329 x 38 =
300 x 40 = 12,000
86 x 45 =
3,870
4 x 8 =4 x 8
Hint: You can change the order, but the product will be the same.
Word Bank: Commutative, Associative, Identity, Zero, Distributive
Commutative Property
5 x 103 =
5 x 103 = 5,000
Round the first number to the hundreds place and the second number to the hundreds place. Then, multiply to estimate.
982 x 143 =
900 x 100 = 90,000
97 x 51 =
4,947
6 x (3x8) = (6x3) x 8
Word Bank: Commutative, Associative, Identity, Zero, Distributive
Associative Property
48 x 103=
48,000
Mrs. Landis wanted her students to practice flashcards for 13 minutes every day. If she has 23 students in her class, about how many minutes would the students practice each day?
Round each number to the tens place, then estimate to solve.
10 x 20 = 200 minutes
336 x 21 =
7,056
6 x 34 = (6x30) + (6x4)
Word Bank: Commutative, Associative, Identity, Zero, Distributive
Distributive Property
True or False: When you estimate a multiplication problem, you should round the numbers first, then solve.
True