## Addition and Subtraction (Within 20) Word Problems

#### Aligned To Common Core Standard:

**Grade 2 Operations** - 2.OA.2

**Keywords That Tell You A Math Word Problem Involves Addition or Subtraction** -
Math word problems are often confusing, and sometimes the terms that are used throw you back a little by using some commonly used math phrases. It tests not only your mathematic skills but also your vocabulary as well. It is a major issue faced by many students.
Here are some of the most common keywords used in math problems, along with what they mean to help you get a better understanding of the questions.
Word problems involving addition will have these keywords:
Sum, all together, in all and total. Word problems involving addition will have these keywords. There are different types of subtractions involved in word problems such as:
Partitioning: Given away, remove and Take away. Inverse addition: how much more to be added. Some of the keywords include are: how many less, smaller, greater, how many are left, how many more and take away.
Comparison: less than or more than. Reducing: how many remaining or how many have been given away.

### Printable Worksheets And Lessons

- Step-by-Step
Lesson- Two digit adding and subtracting. Somewhere in between
we include visuals of single digits too.

- Guided Lesson
- Operations puzzles that look for sums and differences. Followed
by missing addends and subtrahends problems.

- Guided Lesson
Explanation - For the puzzles, I didn't go into too much detail
because as another standard at this level points out, students should
master these skills to 1000. So single digits should be a breeze.

- Practice Worksheet
- Mixed problems with input / output boxes of sums and differences
under 20.

- Matching Problems to Answers Worksheet - Find the missing addends and subtrahends by matching them to where they are missing from.

#### Homework Sheets

We show you how to do one and you do the rest.

- Homework 1- The arrows show you how to arrange your values.
- Homework 2- The answers here can be used as a guide.
- Homework 3- A few lager numbers for you.
- Homework 4- This one is subtraction heavy for you.
- Homework 5- The alignment is everything here.
- Homework 6- We use a different approach to cross outs in this sample.

#### Practice Worksheets

Students are asked to look at the questions in a slightly different way with this one.

- Practice 1- Add and subtract the numbers at the top of the table to each of the numbers in the left column.
- Practice 2- The position is changed on you in this worksheet.
- Practice 3- Solid practice.
- Practice 4- When you add numbers and it leads to a value of 10 or more, make sure to carry the one to the tens place.
- Practice 5- If you are subtracting a large number from a small in the ones column, you can borrow a ten from the tens place.
- Practice 6- A visual place value.

#### Math Skill Quizzes

A whole mess of quizzes for you to have fun with.

- Quiz 1- What's with the dragon?
- Quiz 2- The side to side is switched to up and down.
- Quiz 3- Write the answer on the line.
- Quiz 4- Check out that palm tree.
- Quiz 5- A hot air balloon of tens.
- Quiz 6- There is a scoring key here for you.
- Quiz 7- It's a bit cloudy.
- Quiz 8- Put it all together.

### A Quick Reminder On Addition and Subtraction

When we first begin learning math, we learn our numbers (numeracy). We begin with their names and then we learn how to count them in sequential order. The next step is to learn addition which is simply counting forward. If you go in with this mindset for addition, it will be simple for you. When presented with the problem 7 + 5, it plainly means that we are starting at 7 and need to count up 5 from there. We can do it in our mind as: 7, 8, 9, 10, 11, 12. It helps to see this on a numbers line. As you practice this, you will quickly master skip counting. We can use this same strategy to work with subtraction. See if you are picking up what I am putting down with the example problem: 16 – 7. This just tells us to count 7 down from 16 or 16, 15, 14, 13, 12, 11, 10, 9. As you progress with this skill, you will start to memorize these addition and subtraction problems, but this is a good starting point for you. This series of worksheets cover values that are undergoing subtraction or addition to value that is twenty or less. You can apply all the techniques that we explored here until you get better with this skill.