In math, we use equations and operations (+, –, x, and ÷) to model real world situations and to solve problems. Each operation is used to represent a different situation.

Answer the following using your notes.

In what type of situation would you use addition?

Interactive popup. Assistance may be required.- Combining items into one group;
- Making things larger;
- Finding a total amount.

What hints might you see in a word problem to indicate that you would use addition?

Interactive popup. Assistance may be required.- Situations where items from separate groups are combined into one group;
- Finding a total;
- Accumulating things that are alike.

Read the following word problem and answer the questions below using your notes. If you need a hint, you can hover over the word 'hint.'

In this question, the phrase "all together" was a clue that you needed to use addition to solve the problem. What does the phrase "all together" imply that would let you know that addition is the correct operation to use?

Interactive popup. Assistance may be required. "All together" implies that you are combining the comic books into one group.In your notes, make a list of words that imply combining things into one group.

Interactive popup. Assistance may be required. Combined, added, added to, total, put together, grouped, mixed, pool.Watch the following video to see another example:

The question in this video again used "all together" to represent addition. In what other way did this problem use words to represent addition?

Interactive popup. Assistance may be required. The problem used the phrase "15 more than."How does the phrase "15 more than" represent addition?

Interactive popup. Assistance may be required. To get the number of CDs that Maria has, you need 15 more than Peter's total or Peter's total plus 15.Go back to the list you made in your notes, and add more words that could represent addition.

Interactive popup. Assistance may be required. More than, plus, in addition, above, gain, raise, increase, bigger, taller, also, too.Read the following problem, and answer the questions below.

Three friends decide to pool their money together to buy a video game. John has $12, Stephanie has $15, and Laura has $10. How much money do they have all together?

What operation is needed to solve this problem?

Interactive popup. Assistance may be required. AdditionWhat clues did the problem give you to indicate which operation to use?

Interactive popup. Assistance may be required. The phrases "pool their money together" and "all together."Write an equation for the total amount of money they have.

Interactive popup. Assistance may be required. Total = 12 + 15 + 10