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Break apart and make a ten strategy mental math

Posted by on Sep. 11, 2008 at 5:08 PM
  • 2 Replies

Okay so math was not my strongest subject, I think I know the answer but I want to make certain.  My 4th grader is doing Mental math for the first time today. Please let me know if I got this right.  The break apart  strategy is when you take for example 56 + 43 = ? and turn it into 50 + 6 + 40 + 3 = 99 is that correct?


And the make a ten method is when you round the numbers to the nearest ten and then add them, ie 56 + 43 =?  would be 60 + 49 = 109. Please let me know the info I am finding on the internet is making me more confused.

by on Sep. 11, 2008 at 5:08 PM
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lilyrose73
by on Sep. 11, 2008 at 5:15 PM

You're semi correct : )   You break apart the numbers, like you did, but you want to add them together place value.  56+43  50+40=90  6+3=9     90+9=99  This is a strategy used to help kids add double digit number is their head, and is especially useful when regrouping is needed.

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lilyrose73
by on Sep. 11, 2008 at 5:24 PM

Make a 10 strategy

 

56+43

 

Adding 4 to 56 would equal 60

since you added 4 to 56 you then need to subtract 4 from 43 =39

60+39=99

What ever you do to one number you have to do the opposite to the other number.  It's easier to add when you have a zero in the ones place of one of the numbers, which is the basis of this strategy.

 You could also do

43+7=50

56-7=49

50+49=99

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