Video: Adding One-Digit Numbers to Two-Digit Numbers by Breaking Apart Ones

Make a ten to add. 54 + 8. Pick the calculation that is equal to 54 + 8. [A] 60 + 1 [B] 60 + 6 [C] 60 + 4 [D] 60 + 2. What is 54 + 8?


Video Transcript

Make a 10 to add. 54 plus eight. Pick the calculation that is equal to fifty-four plus eight. Is it 60 plus one, 60 plus six, 60 plus four, or 60 plus two? What is 54 plus eight?

54 can be made from one, two, three, four, five 10s and four ones. Five 10s of 50. 50 plus four is 54. We have to add eight more ones. One, two, three, four, five, six, seven, eight. We’re told to make a 10 to help us add. This is done for us.

There are 10 blocks inside the pink line. We can swap or exchange these 10 ones for one 10s rod. So we’ve taken our 10 ones and exchanged them for one 10. Let’s count how many 10s we have now. One, two, three, four, five, six. Six 10s are 60. So we got six 10s worth sixty and two ones. Six 10s and two ones is 62. And we can partition or break apart number 62 into six 10s, which is 60, and two ones. So, the calculation that is equal to 54 plus eight is 60 plus two. 54 plus eight is 62.

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