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The ideas in this multiplication lesson are taken from Math Mammoth Multiplication 1 book. Only a few examples of each problem type are shown; you should make more problems of each kind for the student. Multiplication in two ways (showing it is commutative)
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Three rows; four dogs in each row. 3 × 4 = 12 |
3 + 3 + 3 + 3 = 12 Four columns; each column has three dogs. 4 × 3 = 12 |
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One row has five giraffes. ___ giraffes 1 × 5 = 5 |
Five columns, each has one giraffe. ___ + ___ + ___ + ___ + ___ giraffes. 5 × 1 = ___ |
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You can do the same multiplication in two different ways but the
result is the same. (Multiplication is commutative.) |
1. Group the animals in two different ways and make the addition and multiplication facts to fit
the pictures.
In what case do you get the same fact either way?
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a.
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b.
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c.
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d.
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2. Draw X marks and group them in two ways to illustrate the two ways to multiply.
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Multiplying two ways on the number line
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3. For each number line, write the two multiplication sentences that the arrows portray.
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4. Write down the
multiplication sentence. Then write the multiplication the other way, and
draw the arrows
for that multiplication sentence.
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5. Skip-count to fill the multiplication table of 3. How does the picture connect with it?

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Next lesson: Multiplying by zero
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