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- Common Core MathK - 8High School

# Grade 2: Number and Operations in Base Ten

790 questions46 skills

# Grade 2: Number and Operations in Base Ten

790 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.

Subtract within 100 using place value blocks

Add within 100 using place value blocks

Subtracting 1s or 10s (no regrouping)

Add and subtract on the number line word problems

Add within 100 using a number line

Add 2-digit numbers by making tens 2

Subtraction word problems within 100

2-step subtraction word problems within 100

Find the missing number (add and subtract within 100)

Add 1s or 10s (no regrouping)

Add on a number line

Subtract 1 or 10

2-step addition word problems within 100

Select strategies for adding within 100

Break apart 2-digit addition problems

Subtract within 100 using a number line

Add 2-digit numbers by making tens

Regroup when adding 1-digit numbers

Addition word problems within 100

## 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.

Subtract within 1,000 using place value blocks

Subtract on a number line

Subtract 10s and 100s (no regrouping)

Estimate to add multi-digit whole numbers

Add on a number line

Add within 1,000 using place value blocks

Add using groups of 10 and 100

Break apart 3-digit addition problems

Select strategies for adding within 1000

Add 10s and 100s (no regrouping)

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.