Multiplying by 10, 100, 1000

In this lesson, we will learn:

• The patterns in multiplying by 10, 100 and 1000 (and their multiples)

Notes:

• A multiple of 10 is any number that has 10 as a factor (Shortcut: a multiple of 10 is any number that ends in zero)
• To multiply a whole number and 10, 100, 1000 (or their multiples)
• Multiply the nonzero digits
• Count the number of zeroes in the factors
• Write the same number of zeroes in the product

$\qquad \quad$ Ex. 30 x 7 00 = 21000

$\qquad \quad$ Ex. 800 x 4000 = 3,200,000