SUPERB! Place the numbers on the number line. Loads of levels. Negative numbers and decimals. Play against the clock for a score. My class's favourite warm up, useful throughout school from year 3 to year 6.
Elementary: Addition, subtraction, multiplication, order numbers, dogs counting, money games, math puzzles
Middle School: estimation by rounding, order of operations, order integers, circle graphs, predictions, line graphs, patterns, percent estimation, money, fractions