10.5 数学， 进位
What am I gonna do first? Everybody in this room what am I going to do first? I’m going to add one side. What’s in the oneside ,Alayna? 3and 7 chrissee ,what is 3 plus 7? Now ,think about number 10.What do I do next? I need to figure out.what digit am I going to put there? The zero .Why am I going to put the zero? The zero is in the ones place
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Even though it’s a zero , I still need to put it in. So zero goes here. What am I gonna do next? Cade , remember we have the number ten, 3 plus seven makes ten. I put my zero here, where does that digit go ? Where ? Right here ? Right here ?no , not quite. Cade , we will put 1 right up here. Because 3 plus 7 equals ten.thinking about my ten. I can’t just leave the number 1 . We couln’t put two digit in one column.so I need to take the 1 because the tens place in the number 10 and keep it in the ten place. Now what am I gonna do , D? And what’s the answer ? All right , I ‘m going to start calling people and come up and write for me . Everyone need to start to put on their thinking cap and sit on their bottom. I want you to tell us what are you doing while you are doing that. You can do that. Who can tell me why he put the 4 over there? Because in the number 14, 4 is in the ones place.