Lesson 4
Practice Makes Perfect
Prowess with powers
Page 141
Your answer :
7( 81 ) + 3( 80 )
= 59
1( 22 ) + 1( 21 ) + 1( 20 )
= 7
3( 101 ) + 4( 100 ) + 5( 10 − 1 )
= 34.5
1( 92 ) + 3( 91 ) + 7( 90 )
= 115
⎫ ⎪ ⎪ ⎬ ⎪ ⎪ ⎭ This set contains a mistake .
7( 81 ) + 3( 80 )
= 7( 8) + 3( 1) = 56 + 3 = 59;
1( 22 ) + 1( 21 ) + 1( 20 )
= 1( 4) + 1( 2) + 1( 1)
= 4 + 2 + 1 = 7;
3( 101 ) + 4( 100 ) + 5( 10 − 1 )
= 3( 10) + 4( 1) + 5⎛ ⎝ ( 1 )/( 10 ) ⎞ ⎠
= 30 + 4 + .5 = 34.5;
1( 92 ) + 3( 91 ) + 7( 90 )
= 1( 81) + 3( 9) + 7( 1)
= 81 + 27 + 7 = 115.
All correct. Return to Page 129 and choose another answer.
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