(Level 2) Select all the expressions with value less than one.

Evaluate the expression.
Evaluate the expression.
(Level 3) Evaluate the following expression.
(Level 3) Evaluate the following expression when
(Level 3) Select all the pairs of numbers that are equivalent.

Simplify the following expression. Express your answer in scientific notation.
Simplify the following expression. Express your answer in scientific notation.
(Level 4) There are 8 elephants in the zoo. Each elephant eats about
