Students use a 99 chart to develop strategies for addition and subtraction.
Cross Number Puzzles— Addition and Subtraction
Students use logical reasoning to find missing numbers in a 3 × 3 grid.
Students control the jumps of a rabbit to investigate number properties.
Students add two-digit and three-digit numbers on an open number line.
Students pair numbers together so that each pair sums to a target value.
Students use ten frames to organize and count a collection of counters.