1.20 Having fun with pocket calculators and negative numbers

Mathematics

Having fun with pocket calculators and negative numbers

Educator section

Memorandum

23. a) -7 m

1. -20 m
2. -16 m
3. -15 m

25. 22nd floor

Leaner section

Content

Activity: having fun with pocket calculators and negative numbers

23. Some friends decided to go bungee jumping. Calculate how far below the bridge each one turned.

a) __________________________________________________________________

b) __________________________________________________________________

c) __________________________________________________________________

d) __________________________________________________________________

24. LET’S PLAY A GAME!!

Work with a friend. Remove the Jack, Queen, King, Ace and Joker from a deck of playing cards. Place the rest of the cards face down between the two of you. Take number 10 as a starting point.

Player 1: Pick up a card. If it is a black card, add the total / the number on the card to 10, but subtract the number if the card is red.

Player 2: Pick up a card. Do the same as player 1.

The players must check each other’s answers. Use a pocket calculator if you are unsure. Continue playing until the totals / numbers on all the cards have been added or subtracted.

25. BRAIN TEASER!

You are in a lift on the 4 ^th floor of a building with basement floors. You come down 6 floors, then go up 13 floors and then come down 11 floors. Then you come down 9 floors and go up 23. You come down 17 floors again and go up 25. At which floor will you get out? ________________ . Show this in a sketch or on a number line.

26. CHALLENGE!

Draw a time line on which you indicate important events that occurred before as well as after your birth. Indicate your birth year as 0.

27. SELF-ASSESSMENT

Tick in the appropriate block: