Dubblor

The exercise was created 2011-10-28 by sormjoleasa. Question count: 32.

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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
20+20 = 40
30+30 = 60
40+40 = 80
50+50 = 100
60+60 120
70+70 = 140
80+80 = 160
90+90 = 180
100+100 = 200
200+200 = 400
300+300 = 600
400+400 = 800
500+500 = 1000
25+25 = 50
250+250 = 500
35+35 = 70
45+45 = 90
15+15 = 30
55+55 = 110
350+350 = 700
150+150 = 300
450+450 = 900

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https://spellic.com/eng/exercise/dubblor.1489531.html