Math Plane 

4/7/12

Why is 8,549,176,320 a special number?

(And, it isn't my phone number!)

HINT

 ANSWER

4/2/12

Parallel lines, triangles, and straight angles

If angle 2 is 38 degrees,

what is angle 3?

SOLUTION

3/28/12

What math symbol can be put between 5 and 9 to get a number greater than 5 AND less than 9?

ANSWER

More "Tricky Puzzles" and games at mathisfun.com

3/25/12

Factors & Multiples

1)   What is the greatest common factor of  5 & 20?

2)   What is the least common multiple of 5 & 20?

F & M SOLUTIONS

3)  A basket of apples: if grouped into twos, threes, or fours, there is one apple leftover.                               But, if separated into groups of five, there are none leftover.

What is the fewest number of apples in the basket?

What is the 2nd fewest # of apples in the basket?

4)  A box of oranges: when grouped by twos, threes, fours, or fives, there is one orange leftover.

What is the fewest number of oranges in the box?

What is the 2nd fewest possible number of oranges in the box?

ORANGE OUTCOMES



3/20/12

What are the last 2 letters in this sequence?

W, A, T, L, T, L, I, ___ , ___

HINT

SOLUTION

3/18/12

What's next in the following sequence:

1

11

21

1112

3112

211213

312213

212223

114213

????

 HINT

SOLUTION

Read about See and Say Sequences and the work of mathematician John Conway.

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