Use a double 10-frame to play a game and represent adding three single-digit numbers. Warm up with a Mystery Math Mistake to decompose teen numbers. Use a double 10-frame to represent adding three ...
Three, as Schoolhouse Rock! told children of the 1970s, is a magic number. Three little pigs; three beds, bowls and bears for Goldilocks; three Star Wars trilogies. You need at least three legs for a ...