Common Core State Standards

# Number & Operations in Base Ten

32 of 220 teaching resources for those 'aha' moments

### Valentine's Day Hundreds Chart Mystery Pictures

Follow the color-coded number guides to fill in the hundreds chart square and reveal 9 special Valentine’s Day images.

10 pages Grades: K - 2

### Adding Four 2-Digit Numbers Task Cards

Practice adding four 2-digit numbers together with this set of 16 task cards.

7 pages Grades: 2 - 3

### 2-digit + 1-digit Task Cards

Practice adding 2-digit and 1-digit numbers with this set of 18 number sentence task cards.

5 pages Grades: 1 - 2
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Practice adding 2-digit numbers with this set of 18 number sentence task cards.

Grades: 2 - 3

### Subtracting 2-Digit Numbers Task Cards

Practice 2-digit subtraction with this set of 18 task cards.

5 pages Grades: 2 - 3

### 2-Digit + 1-Digit Numbers Addition Worksheet

Practice addition involving 2- and 1-digit numbers with this drill and practice worksheet.

2 pages Grades: 1 - 2

### Adding 2-Digit Numbers Worksheet

Practice 2-digit addition with regrouping with this drill and practice worksheet.

2 pages Grades: 2 - 3

### Subtracting 2-Digit Numbers Worksheet

Practice 2-digit subtraction with regrouping with this drill and practice worksheet.

2 pages Grades: 2 - 3

### Whole Numbers on a Number Line Worksheet

Practice finding the missing number on number lines.

4 pages Grades: 1 - 2

### Number Line Match-Up Activity (Up to 120)

Match two-digit whole numbers on a number line with this set of 32 task cards.

9 pages Grades: 1 - 2

### Expanded Form Worksheet

Practice using expanded form up to the thousands place with this 1-page worksheet.

2 pages Grades: 2 - 3

### What's Missing? - 100 More, 100 Less Task Cards

Find numbers 100 more or 100 less than a given number up to 4 digits with this set of 20 task cards.

7 pages Grades: 2 - 3

### What's Missing? - Ten More, Ten Less Task Cards

Find numbers ten more or ten less than a given two- or three-digit number with this set of 20 task cards.

7 pages Grades: 1 - 2

### Missing Addend Picture Puzzle – Level 3

Solve the missing addition sentence by matching the addend with its equation, completing the puzzle.

3 pages Grades: 2 - 3

### Missing Addend Picture Puzzle – Level 2

Solve the missing addition sentence by matching the addend with its equation, completing the puzzle.

3 pages Grades: 2 - 3

### 100 More , 100 Less Match-Up - Three-Digit Numbers

Match 3-digit number cards to find pairs that are 100 more or 100 less of each other.

13 pages Grades: 2 - 3

### Whole Numbers on a Number Line - Task Cards

Identify the missing whole numbers on a number line with this set of 16 task cards.

6 pages Grades: 2 - 3

### Addition to 10 Modeling Mats

Familiarize students with adding single-digit numbers using this set of practice mats.

4 pages Grades: K - 2

### Ten More, Ten Less Match-Up - Two-Digit Numbers

Identify ten more or ten less of a given 2-digit number with this set of 36 match up cards

13 pages Grades: 1 - 2

### Ten More, Ten Less Match-Up - Three-Digit Numbers

Identify ten more or ten less of a given 3-digit number with this set of 36 match up cards.

13 pages Grade: 2

### Different Ways to Write Numbers Worksheet

Practice and review representing number values as digits, words, expanded form, and base ten.

2 pages Grades: 1 - 2

### Ten More, Ten Less Worksheet

Practice or review adding and subtracting 10 from a given number.

4 pages Grades: 1 - 2

### One Hundred More, One Hundred Less Within 999 - Cut and Paste Worksheet

Add and subtract 100 from a given three-digit number in this cut-and-paste worksheet.

3 pages Grade: 2

### More and Less Worksheet

Practice adding and subtracting 10 and 100 to a three-digit number.

2 pages Grade: 2

### Addition Strategy - Decompose, Then Make 10 Worksheet

Build addition strategies using digits 1-10 with this two-page decomposing numbers worksheet.

4 pages Grades: 1 - 2

### Addition Strategy - Counting On Worksheet

Solve addition problems in this 2-page Counting On Addition Worksheet.

4 pages Grades: 1 - 2

### QR Code 3-Digit Place Value Scavenger Hunt

A fun activity where students scan QR codes to go on a 3-digit scavenger hunt in the classroom.

17 pages Grades: 1 - 2

### Subtraction Algorithm PowerPoint Presentation

An engaging subtraction algorithm teaching presentation.

38 pages Grades: 2 - 4

### Addition Algorithm PowerPoint Presentation

An animated teaching presentation focused on the addition algorithm.

23 pages Grades: 2 - 4

### Ten More, Ten Less Within 999 - Cut and Paste Worksheet

Practice adding and subtracting 10 from a given 3-digit number in this cut-and-paste worksheet.

3 pages Grade: 2

### Comparing Three-Digit Numbers Task Cards

Practice comparing 3-digit numbers with the symbols , and = with this set of 20 task cards.

7 pages Grades: 2 - 3

### Ten More, Ten Less Task Cards

Practice identifying 10 more and 10 less than a given number with our set of 24 task cards.

8 pages Grades: 1 - 2