1, Number bonds to 10 — fluent, automatic recall (not counting on fingers), 2, Quantity conservation — understanding that exchanging a ten for ten ones doesn't change the total, 3, Place value understanding — knowing that the digit in the tens place represents groups of ten, not just a number, 4, Flexible counting back — being able to count back from any number, not just from round tens, 5, Decomposition — being able to flexibly break a number apart (e.g. 43 = 30 + 13, not only 40 + 3)

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