1.NBT.6
Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
1. | Which number is 10 less than 30? | |
2. | Which number is 10 less than 20? | |
3. | Which number is 10 less than 10? | |
4. | Which number is 10 less than 50? | |
5. | Which number is 10 less than 40? | |
6. | Which number is 10 less than 80? | |
7. | Which number is 10 less than 60? | |
8. | Which number is 10 less than 90? | |
9. | Which number is 10 less than 70? |