✂️ Estimation
Most of the time you do not need the exact number, you need a good one in a hurry. These drills teach you to round, chop, and size things up well enough to decide, which is the skill that quietly wins timed tests.
Division Estimation →
Round the divisor to a clean number, divide, then nudge the answer. Keep only as many significant digits as the question actually needs.
Truncated Division →
Chop both the top and bottom to their first two or three significant digits, then divide. How many digits you keep depends on how close the options are.
Difference Method →
To compare two fractions, form a new fraction from the gaps between their tops and bottoms, then compare that with the smaller original.
Rounding to Estimate Products →
Round each number to the nearest ten, multiply the round numbers, and you have a fast ballpark. Track which way you rounded to judge if the real answer is a little higher or lower.