Common Core: Number & Operations in Base Ten
2.NBT.A3
Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
October 1, 20182.NBT.A1b
The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).
October 1, 20182.NBT.A1
Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones. Understand the following as special cases:
October 1, 20181.NBT.C6
Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 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.
October 1, 20181.NBT.C5
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
October 1, 20181.NBT.C4
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 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. … Read More “1.NBT.C4”
October 1, 20181.NBT.B3
Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and
October 1, 20181.NBT.B2c
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).
October 1, 20181.NBT.B2b
The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.
October 1, 2018