Build arithmetic confidence with structured multi-number addition activities. **Topics Included:** • Thank You • Addition challenge add three numbers 1 • Addition challenge add three numbers 15 • Addition reasoning add three numbers 24 • Addition reasoning add three numbers 28 • Addition reasoning add three numbers 34 • Addition reasoning add three numbers 43 • Compare the sums add three numbers 19 • Compare the sums add three numbers 38 • Find the sum add three numbers 25 • Find the sum add th