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The ideas in this addition lesson are taken from Add & Subtract 2-B ebook. Only a few examples of each problem type are shown; you should make more problems of each kind for the student. Adding without going to the next ten
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Break down these numbers into their tens part and ones part.
| 18 = 10 + 8
25 = __ + __ |
30 = __ + __
67 = __ + __ |
89 = __ + __
55 = __ + __ |
90 = __ + __
46 = __ + __ |
We can do this the other way around! Add with whole tens.
| 10 + 2 = __
20 + 1 = __ |
50 + 9 = __
80 + 3 = __ |
30 + 8 = __
60 + 0 = __ |
40 + 4 = __
90 + 9 = __ |
Now look carefully at these additions.
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The amount of tens does not change! |
1. In a similar way, add the following numbers. The tens are already shown in the answer picture. Draw more little dots to show the complete answer.
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2. Add. Compare the problems.
| 6 + 2 = __
16 + 2 = __ 26 + 2 = __ 36 + 2 = __ |
4 + 3 = __
14 + 3 = __ 24 + 3 = __ 34 + 3 = __ |
5 + 4 = __
45 + 4 = __ 65 + 4 = __ 35 + 4 = __ |
1 + 7 = __
11 + 7 = __ 61 + 7 = __ 41 + 7 = __ |
3. Add. For each problem, write a corresponding problem with just the ones' digits.
| 46 + 2 = __
6 + 2 = 8 |
52 + 7 = __
__ + __ = __ |
33 + 1 = __
__ + __ = __ |
11 + 5 = __
__ + __ = __ |
4. Find the missing addend.
| 10 + __ = 15
11 + __ = 18 43 + __ = 4532 + __ = 38 72 + __ = 79 |
65 + __ = 69
75 + __ = 78 33 + __ = 3628 + __ = 29 91 + __ = 98 |
5. Find the pattern and continue it!
| 10 + 4 = __
20 + 4 = __ 30 + 4 = ____ + __ = __ __ + __ = __ __ + __ = __ __ + __ = __ |
62 + 2 = __
64 + 2 = __ 66 + 2 = ____ + __ = __ __ + __ = __ __ + __ = __ __ + __ = __ |
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