1st Grade: Number and Operations in Base Ten (1.NBT)

1st Grade Math 1st Grade: Number and Operations in Base Ten (1.NBT)

Number and Operations in Base Ten (1.NBT)

Want Full Access? Join The Many Satisfied MathTA Users!

OR

1.NBT.A.1

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.

Count to 20

START

Read and Write Numbers to 20

Read and Write numbers to 20

START

Count to 120

START

Read and Write Numbers to 120

Read and Write numbers to 120

START

1.NBT.B.2a

Understand 10 can be thought of as a bundle of ten ones — called a “ten.”

Understand ten as bundle of ten ones

Understand ten as a bundle of ten ones

START

1.NBT.B.2b

Understand the numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

Decomposing tens and ones
from 11 to 19

Decomposing tens and ones from 11 to 19

START

Converting 11 to 19 to Standard or Word Form

START

1.NBT.B.2c

Understand 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).

Decomposing tens and ones
from 10 to 99

Decomposing tens and ones from 10 to 99

START

Converting 10 to 99 to Standard or Word Form

START

1.NBT.B.3

Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

Compare Two-Digit Numbers

START

1.NBT.C.4

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.

1.NBT.C.5

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

Add Two-Digit number by 10

START

Subtract Two-Digit number by 10

START

1.NBT.C.6

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.