Subtraction Within 20 with Bar Models

Matholia educational maths video on subtraction within 20 with and without regrouping. Bar models serve as a visual guide for learners as they progress to a deeper, abstract understanding of the concept of subtraction.
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Topic Description:
Building upon the foundational work done with the Subtraction to 10 module, this module provides further experiences with concretely subtracting tens from ones, then connects that proficiency with the more abstract standard algorithm for subtraction with and without regrouping. Word problems are represented with the bar model for the first time here.

Learning Targets:
I can count between 10 and 20 objects.
I can draw models of numbers between 10 and 20 as a ten and some ones.
I can solve subtraction expressions and equations to 20.
I can subtract two 1-digit numbers or a 2-digit number and a 1-digit number using column subtraction.
I can subtract with and without regrouping using column subtraction.
I can solve subtraction word problems to 20.

Suggested Classroom Resources
• Multi-link Cubes
• Base-10 blocks
• Ten frames
• Numeral cards
• Simple dice games
• Number lines
• Pan balance
• Number balance
• Place value mats showing tens and ones columns
• Spinners