Question

Brandon needs 88 boxes of spinners for his fishing club. The cost of each box is $9\$9. How much will Brandon pay?

8×$9=8 × \$9 =

Look at how Brandon solved the problem. Find and describe his error.

8×9=(4×9)+(5×9)8 × 9 = (4 × 9) + (5 × 9)

8×9=36+458 × 9 = 36 + 45

8×9=818 × 9 = 81

Solution

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Brandon incorrectly broke down 8 as 4+54+5 where it should be 4+44+4. So, the correct solution is: 8×9=(4×9)+(4×9)=36+36=728\times 9=(4\times 9)+ (4\times 9)=36+36=72 So, Brandon will pay $72\$72.

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