Author: curriculum

SOL 3.2; 3.5; 3.6; 3.20 a-b

Vocabulary:
Multiplication: repeated addition
Commutative property: changing the order of the factors does not change the product
Equivalent: the same
Factor: number that is multiplied with other numbers
Identity property: when the number 1 is multiplied with another number, that number stays the same
Number sentence: an equation using numbers and operation symbols
Product: answer to a multiplication problem
Quotient: answer to a division problem
Related facts: three numbers that are reordered in 4 number sentences

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5 x 4 = 20

product

factor

12÷6 = 2

quotient

Commutative Property:
6 x 3 = 18 3 x 6 = 18

Two-Digit by One-Digit
1. Multiply the ones place (3x8=24).
2. Write the 4 in the ones place and regroup the 2.
3. Multiply the tens of your top number by the ones of your bottom (3x1=3), then add the regrouped number (3+2=5).
4. Write the 5 in the tens place.

Identity Property:
7 x 1 = 7

Related Facts:
4, 3, 12
4 x 3=12 3 x 4=12
12 ÷ 3=4 12 ÷ 4=3

Ways to Model Multiplication

Pictures

Arrays

Number Lines

3 x 4 = 12
3 “groups of” 4 = 12

5 x 4 = 20
5 “jumps of” 4 = 20