Sharpen mental math & critical thinking skills with this set of 120 riddle cards, each with two to four clues for a number from 1 through 120. Topics include area, perimeter, factors, multiples, place value, multiplication, division, advanced addition and subtraction, remainders, prime numbers, angles, 2-dimensional shapes, decades, centuries, and coins. With so many opportunities to get talking about math, these are great starters and number talksfor your online math lessons! #4thgrademath #5t