(a) (+1) – (+4) = 1 – 4 = -3
(b) (0) – (+2) = 0 – 2 = -2
(c) (+4) – (+1) = 4 – 1 = 3
(d) (0) – (-2) = 0 + 2 = 2
(e) (+4) – (-3) = 4 + 3 = 7
(f) (-4) – (-3) = -4 + 3 = -1
(g) (-1) – (+2) = -1 – 2 = -3
(h) (-2) – (-2) = -2 + 2 = 0
(i) (-1) – (+1) = -1 – 1 = -2
(j) (+3) – (-3) = 3 + 3 = 6
10.1 Bela’s Building of Fun Figure it Out (Page No. 251)
Complete these expressions. Check your answers by thinking about the movement in the mineshaft.
(a) (+40) + _______________ = +200
Solution:
Given (+40) + _______________ = +200
Let (+40) + x = +200
⇒ +x = 200 – 40 = 160
∴ (+40) +
(+160)
= +200
(b) (+40) + _______________ = -200
Solution:
Given (+40) + _______________ = -200
Let (+40) + x = -200
⇒ x = -200 – 40 = -240
∴ (+40) +
(-240)
= -200
(c) (-50)+ _______________ = +200
Solution:
Given (-50) + _______________ = +200
Let (-50) + x = +200
⇒ x = +200 – (-50) = +250
∴ (-50) +
(+250)
= +200
(d) (-50) + _______________ = -200
Solution:
Given (-50) + _______________ = -200
Let (-50) + x = -200
⇒ x = -200 – (-50) = -150
∴ (-50) +
(-150)
= -200
(e) (-200) – (-40) = _______________
Solution:
Given (-200) – (-40) = _______________
Let (-200) – (-40) = x
⇒ (-200) – (-40) = -160 = x
∴ (-200) – (-40) =
-160
(f) (+200) – (+40) = _______________
Solution:
Given (+200) – (+40) = _______________
Let (+200) – (+40) = x
⇒ +160 = x
∴ (+200) – (+40) =
+160
(g) (-200) – (+40) = _______________
Solution:
Given (-200) – (+40) = _______________
Let (-200) – (+40) = x
⇒ (-200) + (-40) = -240 = x
∴ (-200) + (-40) =
-240
10.1 Bela’s Building of Fun Figure it Out (Page No. 253 – 254)