1.NBT.4

Grade 1 · Number & Operations in Base Ten

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. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

Official code: CCSS.MATH.CONTENT.1.NBT.4
Short code: 1.NBT.4
Subject: Mathematics
Grade: Grade 1
Domain: Number & Operations in Base Ten

More Grade 1 Number & Operations in Base Ten standards

1.NBT Number and Operations in Base Ten 1.NBT.1 Count to 120, starting at any number less than 120. In this range, read and write... 1.NBT.2 Understand that the two digits of a two-digit number represent amounts of tens and... 1.NBT.2a 10 can be thought of as a bundle of ten ones — called a "ten." 1.NBT.2b The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six,... 1.NBT.2c The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five,... 1.NBT.3 Compare two two-digit numbers based on meanings of the tens and ones digits, recording... 1.NBT.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without... 1.NBT.6 Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90...

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