Perfect for reinforcing advanced addition skills in Grade 3 math. **Topics Included:** • Thank You • Addition challenge add three numbers 1 • Addition challenge add three numbers 3 • Addition reasoning add three numbers 17 • Addition reasoning add three numbers 28 • Addition reasoning add three numbers 34 • Compare the sums add three numbers 12 • Compare the sums add three numbers 38 • Complete the equation add three numbers 14 • Complete the equation add three numbers 20 • Complete the equatio