Lucy wants to multiply 99x909.She says all she has to do is find 9x909 and then double that number.Explain why Lucy's method will not give the correct answer.
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Answer:
WOOF WOOF
Step-by-step explanation:
Answered by
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Answer:
Lucy's answer will be 81 x 909 short of the correct answer.
Step-by-step explanation:
99 x 909
= (81 + 18) x 909
= 18 x 909 + 81 x 909
= 2 x (9 x 909) + 81 x 909
∴ Lucy's answer will be 81 x 909 short of the correct answer.
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