Review Multiplication and Division

numbers that are multiplied together

• factor

• product

• dividend

• divisor

the answer when you multiply

• factor

• product

• dividend

• divisor

the number that is to be divided

• factor

• product

• dividend

• divisor

the number by which another number is divided

• factor

• product

• dividend

• divisor

the answer when you divide

• quotient

• divisor

• dividend

• multiple

start at a number, then count on by that number

• quotient

• multiple

• product

• factor

a strategy used to multiply 2-digit numbers.

For example: 42 x 57 = (40 +2) x (50 +7)

= (40 x 50) + (40 x 7) + (50 x 40) + (50 x 2)

• compatible numbers

• front-end rounding

• partial products

an estimation strategy that uses pairs of numbers that are easy to work with.

For example: Multiples of 10 or 100 are easy to multiply

• compatible numbers

• front-end rounding

• partial products

an estimation strategy using only the first digit of each number to get an estimate

• compatible numbers

• front-end rounding

• partial products