Page 175 - TB_5B

e . 81.111 f . 112.918 c . 55.425 38.5 = 16.925
4. a. b.
16.925 km
Activity 2
1 . a . 8.81 d . 1.87 + 0.563 = 2.433
2 . a . 146.456
3 . a . 37.16 2.433 kg

c . 12.541 b . 50.567 P. 32~33 2 . a . 73.3 b . 113.32
f . 47.214
4. a. c . 338.358

b . 30.552 c . 48.283 c . 8.8 b . 102.51

b . 108.625

d . 72.72 e . 182.952 Unit 21. Multiplying by Decimals

g . 190.84 h . 15.874

b. P. 38~39

Activity 3 P. 34~35 20,000, 1.23
0.02, 1,230
1 . Sample Answer
For the 2 pyramids on the right, the decimal
2, 4, 8, 3, 1 point moves 1 place to the right.
8.3 4.21 For the 2 pyramids on the left, the decimal
point moves 1 place to the left.
8.3 123, 12,300, 123
4 . 21 123, 123,000, 1,230
12 . 51 8, 48, 4.8
8, 48, 0.48
Sample Answer 8, 48, 0.048
7, 8, 3, 5, 6
35.6 8.7 Activity 1 P. 40~41
1 . a . 0.3, 0.3, 0.3, 0.9
35 . 6
8.7 b . 0.4, 0.4, 0.4, 0.4, 1.6

26 . 9 2 . a . 2.5 b . 4.8

Sample Answer c . 3.2 d . 1.2
2, 4, 6, 7, 8, 9
2.467 0.98 e . 2.7 f . 3.5

2 . 467
0 . 98
1 . 487

3 . a . 1.26 b . 1.41

Activity 4 P. 36~37 c . 3.85 d . 1.36

1 . a . 95.15 + 102.77 = 197.92 e . 1.26 f . 3.8

197.92 points

b . 15.25 9.50 = 5.75

$5.75

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