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# Grade 2: Number and Operations in Base Ten790 questions46 skills

## 2.NBT.A.1

88 questions6 skills
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:

## 2.NBT.A.1a

76 questions5 skills
100 can be thought of as a bundle of ten tens — called a “hundred.”

## 2.NBT.A.1b

76 questions5 skills
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).

## 2.NBT.A.2

86 questions4 skills
Count within 1000; skip-count by 5s, 10s, and 100s.

## 2.NBT.A.3

48 questions4 skills
Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

## 2.NBT.A.4

50 questions2 skills
Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.

## 2.NBT.B.5

336 questions19 skills
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

## 2.NBT.B.6

24 questions2 skills
Add up to four two-digit numbers using strategies based on place value and properties of operations.

## 2.NBT.B.7

170 questions10 skills
Add and subtract within 1000, 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. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

## 2.NBT.B.8

Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.
Skills for this standard are coming soon.

## 2.NBT.B.9

24 questions2 skills
Explain why addition and subtraction strategies work, using place value and the properties of operations.