Tips for Teaching Regrouping
Another good game for teaching regrouping is
Hi, my name is Bassem Saad. I'm an associate math instructor and a math Ph.D. candidate, and I'm here today for About.com to give you some tips to teach regrouping.The first tip is the Carry-One Game. This game works best with groups of four to five. Give each group a spinning wheel numbered one through nine, and you or your teacher aide will have to collect your own blocks and sticks. The blocks represent the tens place in a two-digit number, and the sticks represent the ones place in a two-digit number. Have the kids take turns spinning the wheel and whatever number that lands on, give them that number of sticks.For instance, the first student may spin the wheel and get seven, so they'll collect seven sticks. After some time, that student's turn will come again and they may spin the wheel and collect five sticks. Once they have enough, they can trade in ten of their total number of sticks to get one block. This way they'll have one block and two sticks; this represents the number 12, or the value of 12 sticks.Tip two: Cups and Beans. Get ready a collection of beans and small paper cups, and also give your students worksheets with two-digit sums that require regrouping, like 16, plus 27. And then have the students represent the numbers 16 and 27 with the cups and the beans. So for 16, the students will count out 16 beans; then from the 16 beans, group ten of them into one cup. And then have them count out separately 27 beans. Have them put ten of the 27 in one cup, ten of the 27 in another cup, and leave the remainder seven outside. This will represent the number 27.When they want to add the two numbers, have them take another cup. Gather the remainders of the six and the seven, and count out ten of the six and the seven and put that into another cup. So now they have four cups and a remainder of three beans. This way they can use cups and beans to help count the sum of two-digit numbers that require regrouping.Let's take a look at tip number three: Dissect and Add. We begin with the expression 12, plus 29, and we can write it vertically: 12, plus 29. And then we can dissect the two-digit number into its tens-digit place and its ones-digit place. So 12 is dissected into ten and two; and 29 is dissected into 20 and nine. Then we can add the ones-digit place: two, plus nine -- that's 11. And then we're ready to add a series of two-digit numbers that do not require regrouping: so that's ten, plus 20, plus 11, equals 41. So those are some tips for teaching with regrouping.Thanks for watching, and to learn more, visit us on the web at About.com.