Number Games

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I’m strange. I like number games.

Answers below.

1. What numbers are these: 28, 30, 31 ?

2. What numbers are these: 87, 89, 93 ?

3. What numbers are these: 1, 2, 3, 6 ?

4. What numbers are these: 1, 4, 25 ?

5. What is half of five?

Fractions, ratios, percents, decimals, etc.

50% = 50/100 = 0.50 = ½ = ratio of 50:100 = 180/360 = 180 degrees.

Percents are simply a number expressed as a fraction of 100.

Degrees are simply a number expressed as a fraction of 360.

How come percents can go over 100, but degrees stop at 360? Is it relevant to speak of ‘362 degrees’?

The classic "52 C in a D" puzzles: http://www.woodlands-junior.kent.sch.uk/mathswk.html

R of 72: the Rule of 72 (divide interest rate into 72 to get the number of years for doubling of principal).

Answers:

1. days in the month for a non-leap year

2. octane ratings for regular, plus and premium gas

3. possible scores for football plays (1=PAT, 2=safety or 2pt conversion, 3=field goal, 6=touchdown)

4. national holidays that fall on the same day every year (New Year’s day, Independence day, Christmas)

5. Half of ‘five’ is 4: ‘five’ is four letters, F, I, V, E. Toss out the F & E, and you’re left with half the letters, or half of ‘five’ which is ‘IV’ – roman numeral 4.

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