suppose you get the following arithmetic problem: 36+48 =?  Before you even look at the numbers 36 and 48, you look at the ones digits of these numbers and know right away that the ones digit of the answer will be "4".  What math process/ability enables you to do this? Non-symbolic numerosity Approximate number system Counting principle of abstraction Analogue magnitude representation Number sense

Q: a+64 а-64

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