Multiplication Tricks

What is the first step in the trick for multiplying a two-digit number by 11?

• Multiply the digits together

• Add the digits together

• Subtract the digits

• Divide the digits

When using the trick to multiply by 11, what should you do if the sum of the digits is greater than 9?

• Add 5 to the sum

• Ignore the sum

• Subtract 10 from the sum

• Carry over the extra digit

What is the first step in the method for multiplying a number by 5?

• Double the number

• Add 5 to the number

• Half the number

• Subtract 5 from the number

In the trick for multiplying two-digit numbers by 99, what is the first calculation you perform?

• Add the number to 100

• Subtract the number from 100

• Multiply the number by 10

• Divide the number by 2

How do you combine the results in the two-digit trick for multiplying by 99?

• Subtract one from the other

• Place them side by side in reverse order

• Multiply them

• Add them together

What is the first step in the general method for multiplying any number by 99?

• Add 99 to the number

• Multiply the number by 100

• Multiply the number by 10

• Subtract 99 from the number

After multiplying by 100 in the general method for multiplying by 99, what is the next step?

• Add the original number

• Subtract the original number

• Multiply by 10

• Divide by 2