1. There are four numbers. All the numbers are multiples of 5. All are odd numbers. Their sum is 80. What are the numbers?

5. Choose four consecutive even (or odd) counting numbers. Take the product of the middle two and subtract the product of the first and the last. Try a few samples and formulate a rule.

4. Rational numbers are dense. This means that between any two rational numbers there is always another. With that in mind, find the rational number halfway between 4/5 and 2/3, and the one halfway between 1/2 and 1/3.

6. LIMERICK ARITHMETIC

A multiple of eleven I be,

Not odd, but even you see;

My digits (a pair),

When multiplied there,

Make a cube and a square out of me.

3. ROMAN POEM

Take one hundred one, and to it affix,

The half of a dozen, or if you please six;

Put fifty to this, and then you will see

What every good boy should be.

2. a. It is a three-digit whole number.

b. Its tens digit is 5.

c. It is divisible 4.

d. It is divisible by 9.

e. Each of its digits is different.

7. How much dirt is there in a hole that is three feet wide, four feet long, and two feet deep?