1st Grade - Math - 1.NBT - Numbers and Operations in Base 10
Extend the Counting Sequence
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1.NBT.1
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Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral.
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Understand Place Value
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1.NBT.2
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Understand that the two digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases:
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Web Games
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1.NBT.2a
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10 can be thought of as a bundle of ten ones - called a ten.
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Web Games
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1.NBT.2b
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The numbers 11-19 are composed of ten and one, two, three, four, five, six, seven, eight, or nine ones.
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Notebook Files:
Tech Lesson |
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1.NBT.2c
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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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Web Games
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Notebook Files:
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1.NBT.3
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Compare two two-digit numbers based on meaning of the tens and ones digits, recording results of comparisons with the symbols >, =, <.
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Use place value understanding and properties of operations to add and subtract
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1.NBT.4
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Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based upon place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
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1.NBT.5
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Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
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Notebook Files:
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1.NBT.6
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Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range of 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
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Notebook Files:
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