Fifth graders fix three computation slips wrapped in Halloween scenes — a pumpkin patch selling 150 pumpkins at $4.50, a spider that adds 5/6 + 1/3 without a common denominator, and twelve 2.4 kg candy bags totaling the wrong weight. Fill-in items target tenths place value, the numerator, and what happens when you multiply a decimal by 100.

Two short-answer problems push the work onto paper: subtracting 3/4 of a liter of potion from 2 1/4 liters, and finding the total when six haunted-hayride tickets cost $8.25 each. Catching errors in seasonal contexts builds the habit of checking decimal multiplication and fraction sums even when the problem looks like fun.