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To make solving easier, let's break down 12 and 19 into more convenient numbers, preferably round numbers.
We get:
We'll use the distributive property to solve.
First, we'll multiply the first term in the left parentheses by the first term in the right parentheses.
We'll multiply the first term in the left parentheses by the second term in the right parentheses.
We'll multiply the second term in the left parentheses by the first term in the right parentheses.
We'll multiply the second term in the left parentheses by the second term in the right parentheses.
We get:
Let's solve what's in the parentheses and we get:
Let's solve from left to right:
228
\( 140-70= \)
Breaking numbers into tens and ones makes mental math easier! It's much simpler to multiply 10×10 than to memorize 12×19 directly.
No! You could use other combinations like , but tens plus ones is usually the easiest method to work with.
Write them in order: first×first, first×second, second×first, second×second. For : 10×10, 10×9, 2×10, 2×9.
For problems you see often, memorizing helps! But this method works for any two-digit multiplication and helps you understand why multiplication works.
Double-check by adding in a different order: , , then . Same answer = correct!
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