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Matching Fractions, Decimals and Percentages

Can you match pairs of fractions, decimals and percentages, and beat your previous scores?

Sept 03

What is the last digit of the number 1 / 5^903 ?

Too Close to Call

Weekly Problem 24 - 2012
Can you put these very close fractions into order?

Terminating or Not

Age 11 to 14 Challenge Level:

What are the prime factors of 10?
What are the prime factors of 100?
What are the prime factors of 1000?...


You could rewrite the eight fractions like this:

$$\frac23 \qquad \frac{2^2}5 \qquad \frac{17}{2\times5^2} \qquad \frac3{2^4} $$ $$\frac7{2^2 \times 3} \qquad \frac5{2^3} \qquad \frac{11}{2\times 7} \qquad \frac{2^3}{3 \times 5}$$

What do the fractions with terminating decimals have in common?