Subtract within 20 without regrouping

Today we will learn how to subtract within 20 without regrouping. Math helps us solve problems and understand the world around us.

Regrouping (also called carrying or borrowing) means exchanging one place value for another when adding or subtracting. When adding: If a column sum is 10 or more, regroup by moving the extra to the next column (e.g., 15 ones = 1 ten and 5 ones). When subtracting: If you don't have enough in a place, borrow from the next column (e.g., 1 ten = 10 ones). Regrouping lets you add and subtract any numbers!

Let's break this down step by step so it's easy to understand. Follow along with the examples, and don't worry if it takes some practice to get the hang of it!

Remember: Making mistakes is part of learning. If something is tricky, try again, look at the examples, or ask for help.