Henry

1/42+1/30+1/20+1/12+1/6+1/2=？

hint：1/42=1/6×7，1/30=1/5×6......

Answer explanation

1/42=1/6×7=1/6-7，1/30=1/5×6=1/5-6，.....(telescoping sum)

Convert fraction to a decimal

¹/₂₀₀

Write the mixed number as an improper fraction

5 ⁶/₇

Convert fraction to a decimal

¹⁵/₂₀

Which of the following is larger than 0.34?

• 0.35%

•  $\frac{19}{50}$  

• 34%

• 0.3

Change this decimal to a percent.
0.528

• 528%
• 52.8%
• 5.28%
• 52%

Kennedy Space Center, located on Merritt Island, is also a National Wildlife Refuge. Only about 0.04 of the total area is used for space operations. Which fraction best represents the area used for space operations? （翻译：位于梅里特岛的肯尼迪航天中心也是国家野生动物保护区。只有大约0.04的总面积用于空间操作。哪个部分最能代表用于空间操作的面积）

• ²/₅

• ¹/₂₅

• ¹/₄

• ¹/₂₀₀

do ²/₅ and ¹⁰/₂₅ convert to the same decimal?

• yes

• no

What is the percent of the shaded portion of the figure??

• 20 %

• 60%

• 80%

• 0.6%