## Add and Subtract Within 1000

#### Aligned To Common Core Standard:

**Grade 2 Base Ten** - 2.NBT.7

Tips for Adding Two- and Three-Digit Numbers Have more than 1 number to add up? The addition is the total of a collection of numbers. As we grow, we are expected to learn more than adding just 2+2. But adding big numbers requires a little more effort than just adding up single-digit numbers. When adding multiple sums, it is important to keep a few things in mind. There are many options to add up two and three-digit numbers. But with a few tips, you can easily and quickly add two and three-digit numbers. 1.Regroup numbers- "Regrouping" is the process of making groups of the given number into tens, hundreds, and thousands. The idea of regrouping is imperative to understand in order to add large numbers. With the concept of regrouping, carrying becomes easy and understandable. 2. Use Pictorials for regrouping- A pictorial representation of a number or digit makes solving the sum easy. By drawing blocks of digits, while adding up big numbers, you can swiftly regroup the numbers, and this will make the addition of the numbers easy. These worksheets have students learn to find sums of two and three digit numbers.

### Printable Worksheets And Lessons

- Step-by-step Lesson- Work
on sums and differences of three digit numbers. This lesson provides
six examples.

- Guided Lesson
- Focused on three digit numbers A) Add horizontal B) Subtract vertically
C) Add visually.

- Guided Lesson Explanation
- I touch on the concept of carrying numbers over place values.
It works pretty well.

- Practice Worksheet
- A series of ten problems to work with. I feel there is a good
amount of space to work with here.

- Matching Worksheet - Match the problems to their sum or difference.

#### Homework Sheets

I get a lot of great feedback on these. I have rewritten them about 8 times before I got the spacing right.

- Homework 1- Your standard practice worksheet.
- Homework 2- Joan has 85 pages of reading homework. She has read 43 pages already. How many more pages does she need to read?
- Homework 3- There are 12 trees in the park. The town planted 14 more. How many trees are there now?

#### Practice Worksheets

I made the answers appear in a slightly different shade of gray to make them stick out when printed.

- Practice 1- Mike wants to collect 100 baseball cards. He has 78 already. How many more does he need?
- Practice 2- The craft club has to make 75 bracelets. They have already made 56 of them. How many more do they have to make?
- Practice 3- Bob had 14 goldfish in his pond. He bought 13 more. How many fish does he have now?

#### Math Skill Quizzes

These might seem awkwardly spaced, but it is really helpful for younger students.

- Quiz 1- Mary practiced her dance in dance class 5 times. She also practiced her dance 8 times at home. How many times did she practice the dance?
- Quiz 2- A car dealer had 27 cars in inventory. They bought 16 more cars. How many cars do they now have in inventory?
- Quiz 3- The store had 24 bottles of soda. They sold 9 bottles. How many bottles are left?