Multiplying by 10, 100, 1000

Topic Notes

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