Adding and Subtracting in Standard Form
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Solve the following. Give your answers in standard form:
a. (5 × 103) + (2 × 103)
b. (1.7 × 105) + (3.1 × 105)
c. (4.2 × 102) + (2.5 × 103)
d. (7.8 × 105) + (1.4 × 104)
e. (7.24 × 106) + (3 × 106)
f. (8.01 × 108) + (4 × 103)
g. (4.27 × 105) + (9.3 × 102)
h. (2.9 × 10-5) + (6 × 10-4)
i. (2.01 × 10-2) + (9.3 × 10-4)
j. (4.12 × 10-7) + (8.2 × 10-5)
Solve the following. Give your answers in standard form:
a. (8 × 106) - (3 × 106)
b. (4.81 × 104) - (4.5 × 104)
c. (7.51 × 108) - (4.4 × 107)
d. (8.32 × 107) - (2.1 × 106)
e. (2.7 × 1012) - (3 × 1010)
f. (8.44 × 10-8) - (3.4 × 10-9)
g. (1.6 × 1021) - (3.3 × 1019)
h. (8.132 × 102) - (9.9 × 10-1)
i. (8.01 × 10-4) - (3.3 × 10-3)
j. (5.8311 × 108) - (5.42 × 106)
In a science lab there are three petri dishes. The first dish contains 2.75 × 108
bacteria, the second dish contains 6.12 × 105 bacteria and the third dish
contains 8.345 × 106 bacteria.
In standard form, how much bacteria is there in the three petri dishes in total?
4.
An asteroid was 3.5 × 1011 metres from Earth. It is now 9.391 × 108 metres
closer to Earth. How far away is it now?
5.
Fill in the gaps to make the following questions correct:
a. (7.21 × 104) + (
× 10 ) = 8.01 × 105
b. (2.901 × 108) - (
× 10 ) = 1.3 × 106