Negative Numbers

# Negative Numbers

## Negative Numbers

- - - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - - -
##### Presentation Transcript

1. Negative Numbers Using Negative numbers in context

2. Name: Never heard it before word grid:

3. Which of these calculations below show how to figure out the temperature change? Write these on your MWB. 3 + (-5) (-5) - 3 3 - 5 (-5) + 3

4. Which of these calculations below show how to figure out the temperature change? Write these on your MWB. 11 + (-7) (-11) – (-7) 7 - 11 (-7) + 11

5. 5 – ( - 11) Here is a calculation. Figure out the answer and write it on your MWB.

6. Write the letter A, B or C on your MWB. 5 – ( - 11)

7. Temperature Changes London +13°C Beijing −5°C Paris +22°C Vancouver −11°C

8. Instructions for Working Together • Work together to place cards. • When it is your turn, connect two City Temperature cards using a Changes in Temperature arrow card. • Figure out any missing temperatures. • Explain your calculations. • If others in your group disagree, they should explain why. Then figure out the answer together. • When you have reached an agreement, write your solution in the box on the card.

9. -25Oc +10Oc -10Oc +20Oc

10. Is colder than Is warmer than Is colder than Is warmer than Is colder than Is warmer than Is colder than Is warmer than Is colder than Is warmer than Is colder than Is warmer than

11. Challenge questions • Look back at your poster and see if you can answer these questions using • True / Never / Sometimes • Try to find examples to back up your thinking • Subtraction makes things smaller • Addition makes things bigger • Is there anything else you notice or know about negative numbers? • Can you use your temperature information to convince me that: • • -20 < -10 • • 5 – 20 = -15

12. Sharing your posters • Share with another group, make sure someone from each group explains the reasoning behind their matches • If anyone is unclear then ASK! • Working together, consider changing any of your answers – You are responsible for each others learning • If you decide to change any answers, annotate your work with a different colour pen and write on your poster that this pen colour is a change

13. More Temperature Changes London +8°C +7°C Madrid _ _ _ _ _ _ _ _ _ _ _ Berlin _ _ _ _ _ _ _ _ _ _ _ −12°C Tromso −7°C Tromso −7°C London +8°C _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

14. Calculations • Write a calculation for each of the temperatures you have already written in the boxes • These sums should be written on the dashed lines • When you are finished, share your answers and explain them to another group

15. Class Discussion • Write a calculation for each of the temperatures you have already written in the boxes • These sums should be written on the dashed lines • When you are finished, share your answers and explain them to another group