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.

Lesson Planning and Activity Resources

1.NBT--Interactive games for Numbers & Operations in Base Ten

## 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.

Lesson Planning and Activity ResourcesGrade 1 Unit: Understanding Place Value

(from Georgia Department of Education)

This unit addresses KCAS 1.NBT.2-6 and 1.MD.4.

http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1nbt6

Interactive Material -Subtract multiples of 10 from other multiples of 10.Worksheetssubtracting multiples of 10.