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plus one minus one

English 39 Public

addition and subtraction up to 20 +1 -1

Study Slideshow

1+1

=2

15

1-1

=0

15

2+1

=3

15

2-1

=1

15

3+1

=4

15

3-1

=2

15

4+1

=5

15

4-1

=3

15

5+1

=6

15

5-1

=4

15

6+1

=7

15

6-1

=5

15

7+1

=8

15

7-1

=6

15

8+1

=9

15

8-1

=7

15

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