Add the tens and then add the ones.
| |
 |
60+20=80
5+3=8
80+8=88
|
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50+30=80
3+5=8
80+8=88
|
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40+40=80
4+3=7
80+7=87
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Add the tens
|
Add the tens and then the ones
| ||
30 + 20 = 50
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56 + 30 =86
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64 + 22 = 86
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55 + 12 =67
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40 + 40 =80
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47 + 30 =77
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34 + 25 =59
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45 + 42 =87
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10 + 70 =80
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32 + 60 =92
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21 + 25 =46
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31 + 42 =63
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23 + 40 = 63
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28 + 40 =68
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33 + 33 =66
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42 + 51 =93
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37 + 30 =67
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68 + 30 =98
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71 + 24 =95
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24 + 15 =39
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74 + 10 =84
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82 + 10 =92
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62 + 31 =93
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77 + 11 =88
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