Subtracting in ten groups

Teaching Transcript

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How many more red squares do we have in these ten groups than orange triangles?

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Let's start by looking at the red squares that are in the partly filled ten group. We have 6 of them, so if we remove them and we remove 6 orange triangles, we are a bit closer to seeing the difference.

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Now we have 2 more orange triangles. If we remove those two, and two matching red squares then we've removed one red square for every orange triangle. So the number of red squares remaining is how many more we started with.

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There are 8 red squares remaining, so that is our difference.

This math skill teaches how to subtract using ten groups with borrowing (regrouping). It involves comparing two sets of objects, removing equal amounts from each until all pairs are matched, and determining the remaining objects in one set to find the difference.

Skill Practice

Subtracting in ten groups, including a borrow

Test your understanding of subtracting in ten groups by practicing it! Work through the below exercises to use it in practice.

Ten Groups - Subtract, Without Borrow, Less than 10

Ten Groups - Subtract, Without Borrow, Less than 20

Ten Groups - Subtract, Without Borrow, Less than 30

Ten Groups - Subtract, With Borrow, Less than 20

Ten Groups - Subtract, With Borrow, Less than 30

Ten Groups - To Next Ten, One Digit, Less than 10

Ten Groups - To Next Ten, One Digit, Less than 20

Ten Groups - To Next Ten, One Digit, Less than 30

Ten Groups - To Next Ten, Two Digits, Less than 20

Ten Groups - To Next Ten, Two Digits, Less than 30

Teaching Transcript

🎙️

How many more red squares do we have in these ten groups than orange triangles?

🎙️

There are 8 red squares remaining, so that is our difference.