π Improve flexible thinking with rounding, compatible numbers, and estimation. π **Topics Included:** β’ Approximate powers of 10 mentally β’ Compatible numbers for division β’ Compatible numbers for subtraction β’ Estimating products β’ Estimating sums β’ Estimating with fractions β’ Estimating with mixed numbers β’ Estimating with percents β’ Halving and doubling strategy β’ Mental division using fact families β’ Multiplying by 25 mentally β’ Rounding to subtract quickly β’ Subtraction by making tens β’ S