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# Prime factors grade 4

Introductory lesson for Unit 4 lesson 4
by

## anna sexton

on 3 November 2009

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#### Transcript of Prime factors grade 4

Prime factors and how they are used Used for:
adding and subtracting fractions
with un-like denominators
to find
a common factor Multiplying
3 factors Prime factorization Factor trees A way to Organize the factors of a number
in order to find ALL the factors Exponents Orange crate problem
3 rows of 4 oranges
in 4 layers is...
How many oranges? commutative 3 rows X 4 each row X 4 layers = ? OR 4 layers X 4 each row X 3 rows =? 3 X 4 X 4 =
12 X 4 =
48 4 X 4 X 3 =
16 X 3 =
48 property So hows does an exponent
fit in with factoring? remember our multiplication equation? 3 X 2 x 2 X 2 X 2 = 48 3 x 2 x 2 x 2 x 2 = 48 Sure, but, that's a lot of 2's! Can we shorten it? 3 x (2 multiplied how many times?) = 48 3 x 2 = 48 4
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