65 Views

Download Presentation
##### Do I add or subtract??

**An Image/Link below is provided (as is) to download presentation**

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -

**Do I add or subtract??**How do I know when I should add? How do I know that I am supposed to subtract?**3 + 4 = 7**7 + 2 = 9 4 + 2 = 6 5 + 7 = 12 7 - 2 = 5 9 - 2 = 7 3 - 1 = 2 6 - 3 = 3 Look at these problems. What is the pattern?**The number starts small and gets larger.**The largest number is at the end. Clue words: in all more together The number starts big and gets smaller. The largest number is at the beginning. Clue words: away left Adding Subtracting**Try these!**• 7 ____ 2 = 9 • Start at 7. • It gets larger! (7 went to 9) • The largest number (9) is at the end. • We ADD!!!**Can you do this one?**• 8 ______ 2 = 6 • Start at 8. • It gets smaller! (8 went to 6) • The largest number is at the beginning. • We SUBTRACT!!!**More challenges…**• 5 _____ 5 = 10 • 5 _____ 2 = 3 • 6 _____ 2 = 8 • 4 _____ 1 = 3**Adding**The number gets larger. The largest number is at the end. Clue words: in all together more Subtracting The number gets smaller. The largest number is in the beginning. Clue words: away left Let’s review…**Congratulations!!**• You are an expert! • Use these rules to help you decide whether to ADD or subtract. • Don’t get tricked by the math monster!