Page 185 - NUMINO TB_4B

6.9 5.89 1.01 Activity 3 P. 48~49
6.8 5.78 1.02
6.11 5.06 1.05 12, 27, 39
54, 15, 39
Unit 21. Unit Area b . 55
1 . a. 108 d . 236
P. 40~41 c . 63 f . 80
e . 528
Squares are better to measure the area of the P. 50
land because there are no empty spaces Challenge
between the squares, but for circles, there are 1 . a. 2, 4
many empty spaces between the shapes.
Therefore, it is better to measure the area of the b . 3, 4
land by counting the number of squares. c . 3, 4

Squares are the best shapes to measure the Unit 22. Perimeter of the Park
area because they satisfy the 3 given conditions.
Squares are easy to draw and easy to count. P. 52~53
Both parks have the perimeter of 25 feet.
Activity 1 c . 16 d . 12 P. 42~43
1 . b. 10 g. 8 h. 8 Activity 1 1 23 P. 54~55
k . 12 l . 18 e . 14 4 8 12
f . 10 o . 12 i . 12 Length(cm) 4
j. 9 m. 8 Perimeter(cm) 16
n. 9

Activity 2 P. 44~47 1. a. 6 b. 8
1 . a . 50 ft2
c . 49 cm2 d . 28 m2 2 . Unknown side: 7 m

Perimeter: 4 7 28 (m)

f . 28 in.2 g . 16 yd2 Length(cm) 4 5 6

2 . a. 5, 5 b. 3 Width(cm) 2 3 4

c . 7 d . 9, 9 Perimeter(cm) 12 16 20

e . 12 f . 4, 4 3. a. 6 b . 17 c . 13

3 . a . 49 4 . a. Unknown side: 3 cm

7, 7 ft Perimeter: 22 cm

b. 6 6 4 b . Unknown side: 9 cm

36 4 Perimeter: 26 cm
9,
9 cm

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