Build strong number sense through structured mental math exercises. **Topics Included:** • Thank You • Checking the reasonableness of answers • Compatible numbers in division • Converting fractions and decimals mentally • Division estimation strategies • Doubling and halving strategies • Estimating multiplication • Estimating percent increase and decrease • Estimating percentages • Estimating speed and time • Estimating sums and differences • Estimating surface area and volume • Estimating temp