Five supplementary math exercises, all the answers on pages 78 and 79.

Page 78

1. Form exemption

2 . 6 . 28÷3. 14 = 2(cm)2×2 = 4(cm？ )

3.( 10+30)÷2=20(cm) 20？ ×3. 14= 1256(cm？ )

4. (Exemption, too much)

Page 79

1( 1)2 4 12.56 12.56

(2) Half radius of perimeter

2 circumference: 2× 2× 3.14 =12.56 (cm) area: 2? ×3. 14= 12.56(cm？ )

3 rd research and development center

16m 50.24m 200.96m？

5 decimeter 3 14dm 78.5dm?

4 cm, 8 cm and 50.24 cm?

1 . c:6×2×3. 14 = 37.68(cm)2. 18÷3. 14 = 56.52(m)3。 3. 14× 1.4=4.396 (Deutsche Mark)

Student 6? ×3. 14 = 1 13.04(cm？ ) 18÷2 = 9(m) 1.4÷2 = 0.7(DM)

9? ×3. 14=254.34(m？ ) 0.7? ×3. 14 = 1.5386 1(DM？ )