standard_description: Use variables to represent numbers and write expressions when solving a real-world or mathematical problem; understand that a variable can represent an unknown number, or, depending on the purpose at hand, any number in a specified set.
problem_activity: Nyan Cat travels at
$$4.2\times10^2$$
miles per hour. Grumpy Cat travels at a pokey
$$7\times10^{-1}$$
miles per hour.
a.   How many times faster is Nyan Cat traveling than Grumpy Cat?
b.   The Peregrine Falcon, the fastest bird, can fly up to half of Nyan Cat’s speed. How fast can a Peregrine Falcon fly? Write your answer in decimal notation and scientific notation.


aligns: no