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Understand place value.
1.NBT.2
2. Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as
special cases:
a. 10 can be thought of as a bundle of ten ones—called a “ten.”
b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
c. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens
(and 0 ones).
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2.NBT.2
2. Count within 1000; skip-count by 2s, 5s, 10s, and 100s. CA
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3.NBT.2
2. Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations,
and/or the relationship between addition and subtraction.
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2. Read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form. Compare two multi-
digit numbers based on meanings of the digits in each place, using >, =, and < symbols to record the results of comparisons.
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5.NBT.2
2. Explain patterns in the number of zeros of the product when multiplying a number by powers of 10, and explain patterns in
the placement of the decimal point when a decimal is multiplied or divided by a power of 10. Use whole-number exponents
to denote powers of 10.
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