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Adding Fast Nines.

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Presentation on theme: "Adding Fast Nines."— Presentation transcript:

1 Adding Fast Nines

2 Hey… I sure wish I knew a faster way to add 9 to a number...
I just thought of something! I sure wish I knew a faster way to add 9 to a number...

3 27+10= 37 37-1= 36 27+9=

4 7+10= 17 17-1= 16 7+9=

5 67+10= 77 77-1= 76 67+9=

6 22+10= 32 32-1= 31 22+9=

7 55+10= 65 65-1= 64 55+9=

8 160+10= 170 169 170-1= 160+9=

9 117 107+10= 116 117-1= 107+9=

10 58+10= 68 68-1= 67 58+9=

11 25+10= 35 34 35-1= 25+9=

12 21+10= 31 31-1= 30 21+9=

13 77+10= 87 87-1= 86 77+9=

14 100+10= 110 109 110-1= 100+9=

15 100 90+10= 99 100-1= 90+9=

16 190+10= 200 199 200-1= 190+9=

17 5+10= 15 14 15-1= 5+9=

18 111+10= 121 120 121-1= 111+9=

19 101+10= 111 110 x-1= 101+9=

20 150+10= 160 159 160-1= 150+9=

21 144+10= 154 153 154-1= 144+9=

22 149+10= 159 158 159-1= 149+9=

23 177+10= 187 186 187-1= 177+9=

24 182+10= 192 191 192-1= 182+9=

25 179+10= 189 188 189-1= 179+9=


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