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**1-digit by 4-digit Multiplication**

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**1-digit x 4-digit Multiplication**

THINK! Can we apply the same methods we used when we multiplied a 1-digit by 2-digit and 1-digit by 3-digit number to a 1 digit by 4-digit multiplication problem??

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**1-digit x 4-digit Multiplication**

Remember: For every PLACE VALUE added in the number you ADD an area or a rectangle 6 X 23 7 X 233 8 X 6, 345 What patterns do you notice?

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**2-digit by 2-digit Multiplication**

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**2 x 2-Digit Multiplication**

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**2-digit by 2-digit Multiplication**

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43 x 27 = ? Expand the numbers by place values Draw a rectangle and label the dimensions Find the “area” of each rectangle by multiplying the dimensions Then add the partial products 800 280 60 21 40 3 40 x 7 = 280 40 x 20 = 800 ? + 3 x 7 = 21 3 x 20 = 60 1,161

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Your Turn! Practice this problem on your own… 45 X 62

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