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.
