Reply to FYI: Indiana withdrawing from Common Core standards

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Reply to "FYI: Indiana withdrawing from Common Core standards"

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[quote=Anonymous][quote=Anonymous]
Dear Jack,

What you did right was subtract the hundreds on the number line. What you did wrong was subtract seven tens instead of one ten and six ones. To fix your mistake, you should subtract one ten and six ones.

Sincerely,

Student[/quote]

I agree that is what "Jack" was supposed to do. I saw this worksheet on Facebook last week and figured it out.

However, the number line doesn't seem to match the the one 10 and 6 ones approach after the mark for 127. There are only 6 "tick marks" total (I assume they're supposed to represent 117, 116, 115, 114, 113, 112). So why does it stop at 112? Yet the last mark is labeled 121 - not the correct answer either. I am clueless on what that means. It looks like the student subtracted 20 and then five 10s.

It'd be nice to see an original version of this problem and not whatever the father might have filled in.

My child is in 4th grade and the common core math is making more sense this year than in past years.  I also think doing subtraction of 3-digit numbers on a number line is silly. [/quote]

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