Do this exercise without using a calculator 
1. Calculate:
|
a. -2 + 4 |
b. -5 + -19 |
c. 4 − 2 |
|
d. 8 + - 5 |
e. 4 + -2 + -2 |
f. -8 + 4 |
|
g. -4 + -2 |
h. -100 − 120 |
i. -8 − 4 |
|
j. -2 − -4 |
k. 5 − -2 + 3 |
l. -4 − 4 − 4 |
|
m. 14 + -4 |
n. 4 + (-3 + 2) |
o. -4 − 2 + 4 |
|
p. -4 − -4 |
q. 0 − 3 + -2 |
r. 2 − (-4 + 5) |
2. Calculate:
|
a. -2 × 4 |
b. -5 × -2 |
c. 4 × -2 |
|
d. -8 × -5 |
e. 4 × -4 × -4 |
f. -8 × 4 × -2 |
|
g. -4 ÷ 2 |
h. -12 ÷ -6 |
i. -16 ÷ 4 |
|
j. -2 × -4 + 3 |
k. (-4)2 × 4 |
l. (-4)4 × 4 |
|
m. 14 ÷ -2 × 2 |
n. (-3)3 × 2 +1 |
o. -4 × -2 × 4 |
|
p. -4 ÷ -4 × -1 |
q.12 − -4 × 3 + -1 |
r. 2 − -4 × 6 + -2 |
3. Evaluate, if a = − 2 and b = 4:
a. 2b ÷ 4
b. 2b3
c. -4ab
d. 3a2
e. a2 − b2
f. (a + b)3 − (a − b)2
4. a. I start off with $230 in the bank and then buy a fridge for $145, a walkman for $135 and a chair for $45.60.
Luckily my bank manager 
allows me an overdraft. What is the balance of my account?
b. The temperature at Heathrow airport in London in January is 4°C at 10 pm. In the next 8 hours, the temperature falls 6 degrees.
What is the temperature at 6 am on the next morning?
