Subtracting Multiples of Ten

What is a common characteristic of multiples of ten?

• They all have a zero in the ones place.

• They are all prime numbers.

• They are all odd numbers.

• They all end in five.

How can you think of 50 minus 20 to make it easier?

• Asking what number plus 20 equals 50.

• Subtracting 10 from 50 first.

• Multiplying 20 by 2.

• Adding 20 to 50.

How many tens do you add to 20 to reach 50?

• Two tens

• Four tens

• Five tens

• Three tens

When solving 70 minus 40, how many times do you count back by ten?

• Four times

• Five times

• Two times

• Three times

What method can be used to solve subtraction of multiples of ten?

• Dividing by ten

• Multiplying by ten

• Counting back by tens

• Counting forward by ones