What two ways can you find the product of 8x997 using mental math

1 answer:

7 0

8=10-2 or
997=1000-3
so we can use distributive property
remember, a(b+c)=ab+ac

for the first one
8(997)=(10-2)(997)=997(10-2)=997(10)+997(-2)=9970-1994=7976

2nd one
8(997)=8(1000-3)=8(1000)+8(-3)=8000-24=7976

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If triangle DEF has a 90° angle at vertex E, which statements are true? Check all that apply.

Margaret [11]

Draw a diagram (shown below as attachment)

check each option

1st one: obtuse triangle
osbuse means that the triangle has an angle more than 90 degrees
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2nd: angle at D is acute
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3rd: angle at F is obtuse
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3rd option is wrong

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