Common Core was invented by a jew to "End White privilege"
(media.scored.co)
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The skill they're trying to teach is to round 28 to ~30, and 103 to ~100, so then you can easily do 100 - 70 in your head.
But this is a retarded-as-fuck way to teach that skill ffs.
Unless, you know, the beginning of the section which is not pictured instructed the student to estimate in the following problems.
The phrasing is bad, as so often seen at this instruction level. Both instructions and exact problem wording should unambiguously specify the intended method. Here the instructor has a very narrow specialized meaning of "reasonable" in mind, which is not a word to hang a specialized definition on as it creates an unnoticed seed of schizophrenia in the kids.