Solution: Page 246 (Inverses)

Figure it Out - Combining Presses

Evaluate these expressions:

• a. (+1) + (+4) = $+5$
• b. (+4) + (+1) = $+5$
• c. (+4) + (-3) + (-2) =
  • $4 - 3 = 1$
  • $1 - 2 = -1$
  • Answer: $-1$
• d. (-1) + (+2) + (-3) =
  • $-1 + 2 = +1$
  • $+1 - 3 = -2$
  • Answer: $-2$

Inverses

Write the inverses of these numbers:

• Inverse of +4 is -4.
• Inverse of -4 is +4.
• Inverse of -3 is +3.
• Inverse of 0 is 0.
• Inverse of +2 is -2.
• Inverse of -1 is +1.

Comparing Numbers using Floors:

• Jay (Art Centre): Floor +2.
• Asin (Sports Centre): Floor +5.
• Binnu (Cinema): Floor -3.
• Aman (Toys): Floor -1.

Who is on the lowest floor? Binnu is on Floor -3, which is the lowest number (deepest underground).