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Doubles
0 + 0 = 0
1+1=2
2+2=4
3+3=6
4+4=8
5+5=10
6+6=12
7+7=14
8+8=16
9+9=18
10+10=20
11+11=22
12+12=24
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If you learn your doubles then you also
know your 2x
tables
because the 2 means 2 groups of ..
2 groups of 5 = 10
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2 x 0 = 0
2 x 1 = 2
2 x 2 = 4
2 x 3 = 6
2 x 4 = 8
2 x 5 = 10
2 x 6 = 12
2 x 7 = 14
2 x 8 = 16
2 x 9 = 18
2 x10 = 20
2 x11 = 22
2 x12 = 24
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5 x 0 = 0
5 x 1 = 5
5 x 2 = 10
5 x 3 = 15
5 x 4 = 20
5 x 5 = 25
5 x 6 = 30
5 x 7 = 35
5 x 8 = 40
5 x 9 = 45
5 x10 = 50
5 x11 = 55
5 x12 = 60
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10 x 0= 0
10 x 1 = 10
10 x 2 = 20
10 x 3 = 30
10 x 4 = 40
10 x 5 = 50
10 x 6 = 60
10 x 7 = 70
10 x 8 = 80
10 x 9 = 90
10 x10 =100
10 x11 =110
10 x12 =120
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Skip counting in
2s and 5s and 10s
gives you all the x tables answers.
Try it:
2s:0,2,4,6,8,10,12,14,
16,18,20,22,24
5s:0,5,10,15,20,25,30,
35,40,45,50,55,60
10s:0,10,20,30,40,50,60,
70,80,90,100,110,120
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