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### Course: Numbers & Operations - The Real & Complex Number Systems 176-188>Unit 2

Lesson 2: Strategies for adding within 100

# Breaking apart 2-digit addition problems

## Want to join the conversation?

• How do you break apart 6 digit number?
• Like you'd break apart any other number!
For example,
283,729
200,000 + 80,000 + 3,000 + 700 + 20 + 9
• how do you add 39 + 61
• Well, try breaking it up.
30+60, and 9+1
30+60 is 90, because 3+6 is 9. And 9+1 is 10!! Meaning, 90+10 is 100, so your answer is 100.
• How are kids today being taught to add two digit numbers horizontally, when the second digits sum is greater than 9?

ex: 45 + 19 =
• 45 = 40 + 5
19 = 10 + 9
Combine all the tens and the ones:
(40+10) + (5+9) = 50 + 14 = 64
• What did you break up at ?
• He is saying that in the options, the numbers are represented as tens and ones, instead of a normal number. For example, in this case, the 41 is represented as 4 tens and 1 one; but a different way to broke up the numbers is to represent them as a normal number, so that would be 40 + 1.
• Hi khan academy how do you break apart 5 digit numbers