Using Doubles to Subtract Interactive PowerPoint Slideshow Created by: Sue Ann Dixon Educational Technologist Stowers School Ft. Benning, Georgia

Note to Teacher Make sure the students understand using doubles to subtract numbers. Show students how to use the scroll bar to move from one slide to the next. Students should do Slides 3-12 first. After students have completed slides 3-12; click on Slide Show; View Show and have students check their answers. Or….use the Infocus machine with the whole class one slide at a time.

Finish each number sentence. + = - =

Finish each number sentence. + = - =

Finish each number sentence. + = - =

Finish each number sentence. + = - =

Add the doubles. Then subtract. 3 +3 6 -3 5 +5 10 -5

Add the doubles. Then subtract. 1 + 1 = 2 - 1 = 4 + 4 = 8 - 4 =

Add the doubles. Then subtract. 3 + 3 = 6 - 3 = 5 + 5 = 10 - 5 =

Add the doubles. Then subtract. 2 + 2 = 4 - 2 = 6 + 6 = 12 - 6 =

Add the doubles. Then subtract. 3 + 3 = 6 - 3 = 1 + 1 = 2 - 1 =

Add the doubles. Then subtract. 4 + 4 = 8 - 4 = 2 + 2 = 4 - 2 =

Finish each number sentence. 3 + 3 = 6 6 - 3 = 3

Finish each number sentence. 2 + 2 = 4 4 - 2 = 2

Finish each number sentence. 5 + 5 = 10 10 - 5 = 5

Finish each number sentence. 4 + 4 = 8 8 - 4 = 4

Add the doubles. Then subtract. 3 +3 6 6 -3 3 5 +5 10 10 -5 5

Add the doubles. Then subtract. 1 + 1 = 2 2 - 1 = 1 4 + 4 = 8 8 - 4 = 4

Add the doubles. Then subtract. 3 + 3 = 6 6 - 3 = 3 5 + 5 = 10 10 - 5 = 5

Add the doubles. Then subtract. 2 + 2 = 4 4 - 2 = 2 6 + 6 = 12 12 - 6 = 6

Add the doubles. Then subtract. 3 + 3 = 6 6 - 3 = 3 1 + 1 = 2 2 - 1 = 1

Add the doubles. Then subtract. 4 + 4 = 8 8 - 4 = 4 2 + 2 = 4 4 - 2 = 2

The End Click on the mouse Click on the red X to close Click “no”