Thursday, Nov 21st 2024

Learning to “Regroup” Ones to Tens

This weekend, my granddaughter visited for a long overnight stay. She reminds me she is now six years old, and will be in 1st grade in the next school year. We had not done any * “formal” math work in a few months. So, I told her I wanted to do some number work with her. What a happy surprise for me when she pulled out her pack of addition and subtraction cards.

These are a few of the many facts she knows. She calls them Fast cards, rather than “Quicks.” The cards in the paperclip section need to be practiced more.

*We always do some form of math. I often ask her some math questions such as, “Do you want 2+3 grapes or 7+4 grapes?” Or, during rides in the car, I give her simple multiplication to solve. “If there are 3 girls, and they stick their arms out, how many arms will you see?”

If you have read my previous posts, you saw I explained how to help children learn math facts using my Math Facts Program.

Then she wrote a math fact out for me: 87 + 5. Well, I had intended to introduce some addition with 2 place numbers, so this was a perfect way to help her learn how to get the answer.

She used Unifix cubes to show the number 49 as 4 tens and 9 ones. Then we together counted the tens: 10, 20, 30, 40 and then with the ones: 41, 42, 43… to 49.
After adding 1 more Unifix cube to the one’s column, she saw that 10 ones cannot physically fit in the one’s column. We made a trade. She gave me 10 ones and I gave her a new ten. She placed the new ten (The black Unifix cube) in the ten’s column on the place value tray.
Finally, she did the math on paper adding 1 to 9. She knew the 10 needs to be shown as 1 “new” ten and placed in the ten’s column, and finished writing 10 with zero in the one’s column. She then counted the tens: 10, 20, 30, 40, 50.

We did a few more of these simple problems using the Unifix cubes. Then I gave her a paper with four more problems which she answered without using the Unifix cubes. One of those problems did NOT need any regrouping. I don’t want children to learn how to do regroup and think they always need to regroup. She handled it!

If you do not have this type of Unifix tray, you can make your own. See my post from October 12, 2020: Teaching Addition and Place Value. If you would like more information on how to teach addition and subtraction and place value, this workbook, Beyond Math Facts, is the one to choose. It can be used along with Two Plus Two Is Not Five. As children are learning new facts, they can do more advanced adding and subtracting in this book.

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