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plus one minus one

English 39 Public

addition and subtraction up to 20 +1 -1

Study Slideshow

9+1

=10

15

9-1

=8

15

10+1

=11

15

10-1

=9

15

11+1

=12

15

11-1

=10

15

12+1

=13

15

12-1

=11

15

13+1

=14

15

13-1

=12

15

14 + 1

=15

15

14-1

=13

15

15+1

=16

15

15-1

=14

15

16+1

=17

15

16-1

=15

15

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