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Multiply and Divide  by Multiples 10
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Remember:
factor x factor = product
Multiply and Divide  by Multiples 10
Multiples of 10, 100, 1,000
Multiply by Multiples 10
Multiply the whole numbers in each. Add as many zeros as
there are in the factors to the product.
Example:    40 x 90 = ?
Multiply the whole numbers ( 4 x 9 = 36
Add the zeros to the 36 (3600
answer:    40 x 90 = 3,600
Example 2: 500 x 30 = ?
5 x 3 = 15, add three zeros (15000). Answer: 500 x 30 = 15,000
Divide  by Multiples 10
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Divide the front digits and write the quotient.
Cross out the zeros that match up from both numbers.
Example: 3,500 ÷ 70
1: Rewrite the dividend and divisor using multiples of 10
3,500 = 350 x 10
and
70 = 7 x 10
2: Divide 350 by 7
350 ÷ 7 = 50
3,500 ÷ 7 = 50
Remember:
dividend
÷ divisor = quotient