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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! |
Example problem types
Example problem types
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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stands for a mystery number between 1 and 100. See if you can
compare the expressions without knowing the mystery
number!
The fast, FUN, and easy way to learn multiplication. Learn the upper times tales in two sittings using mnemonic stories.
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Copyright 2003-2013 Maria Miller
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