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So let’s get started. Here is our first problem 34 minus or take away nine. Thirty four is three tens and 4 ones. We want to take 9 away from 34 but there aren’t 9 ones to take away, there are only 4 ones. So we need to borrow and regroup one of the tens. How do we do this? Let’s see if a story will help us understand.
Let’s say I live in the ones house. I have nine friends that come over for lunch. I want to feed them hotdogs but I only have 4 hotdogs and I need nine. So I have to go to the neighbor’s house next door to borrow. I go to the tens place house to ask for more hotdogs. At the ten house I ask to borrow some hotdogs, but at the tens house, they only shop at Sam’s club and only buy things in packs of 10. The packs of hotdogs in the tens house are in packs of ten. You can see five on top and five are hiding underneath. At the tens house, they will never give out 5 or 8 or some other number. They only give out one group of 10. Today the person at the tens house has 3 packs of hotdogs and he shares 1 pack. So I take one pack of 10 hotdogs and say thank you, of course, and go back to my ones house.
Now the tens house only has 2 packs of ten hotdogs because it gave one pack away. See how on the problem I crossed out the 3. Instead of 3 packs, there are 2 packs and since each pack has ten, there are really 20 hotdogs at the tens house. At my ones house I split up the pack of 10 hotdogs so now I have 14 hotdogs. Altogether there are still 34 hotdogs but now only 20 are at the tens house and 14 are at the ones house. This is what we call regrouping. I have regrouped the hotdogs by taking 10 hotdogs from the tens house and giving them to the ones house.
Now I feed my friends the nine hotdogs, everyone is happy and I have 5 left. 14 minus 9 is 5. My neighbor still has 2 packs of 10 which is 20, so together we have 20 plus 5 which is 25.
Let’s try another one 56 minus 8. In the tens house we have 5 packs of 10 hotdogs which is 50. And in the ones house we have 6 hotdogs. 8 hungry friends come over to eat, but I only have 6 hotdogs, so what can I do? That’s right. I have to go next door and get a pack of 10 hotdogs.
I go next door and get one pack of 10 hotdogs. Now the tens house only has 4 packs of ten hotdogs which equals 40 hotdogs. I break up the pack of hotdogs and now I have 10 more hotdogs to add to my 6 hotdogs so now I have 16 hotdogs.
I feed my 8 friends and that leaves me with 8 hotdogs. The tens house has 4 packs of 10 which equals 40. So the total that is left is 48. 56 minus 8 is 48. If you understand what we just did then click on the next lesson tab. If you don’t understand, listen to this video again and try acting it out yourself using your base ten blocks or some pretend hotdogs. You could use popsicle sticks or straws for hotdogs.