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December 7th, 2018, 05:03 AM   #1
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exploring elementary exercise

The exercise is:
$\ \ \ $ 53
$-$ 26
-----

What should the pupil have to know to solve this exercise?
What is the preliminary knowledge they need to solve the exercise?

Last edited by skipjack; December 7th, 2018 at 11:10 AM.
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December 7th, 2018, 05:07 AM   #2
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26 + ? = 53
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December 7th, 2018, 07:37 AM   #3
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Math Focus: Elementary mathematics and beyond
13 - 6 = 7
40 - 20 = 20
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December 7th, 2018, 08:24 AM   #4
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"Numbers don't lie. They hide, but they don't lie."

Numbers make some people numb.
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