The visual nature of this worksheet makes it ideal to project for an all-class warm up. Learners first complete two horizontal addition problems involving three-digit addends. Consider whether or not you will encourage them to rewrite vertically or use place-value knowledge to complete as is. Then, they find the difference between three-digit numbers in two subtraction problems. Finally, learners write their own addition problem by counting a row of pears to find the addends and solving for the total.