The diameter of the earth is approximately 13 000 kilometres.
Which of these shows 13 000 in scientific notation?
| `1.3 xx 10^3` | `1.3 xx 10^4` | `1.3 xx 10^5` | `1.3 xx 10^6` |
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Number, NAP-D4-NC26
The age of the Universe is estimated to be 14 000 000 000 years old.
This number can also be written as
| `1.4 xx 10^9` | `1.4 xx 10^10` | `14 xx 10^10` | `14 xx 10^11` |
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Number, NAP-C4-NC26
An insect expert estimates that an anthill 30 cm high contains `10^8` ants.
He also estimates that a 25 cm high anthill contains `10^7` ants.
If his estimations are correct, how many more ants live in the 30 cm high anthill than the 25 cm high one?
| `text(9 million)` | `text(10 million)` | `text(90 million)` | `text(100 million)` |
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Number, NAP-F4-CA26
A red blood cell and a white blood cell have a combined total mass of `1.3 xx 10^-10` grams.
If the red blood cell has a mass of `3 xx 10^-11` grams, what is the mass of the white blood cell?
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`1 xx 10^-10\ text(grams)` |
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`1 xx 10^-11\ text(grams)` |
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`1.7 xx 10^-10\ text(grams)` |
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`1.7 xx 10^-11\ text(grams)` |
Number, NAP-H4-CA08
One billion is one thousand million.
Which of the following is 20 billion?
| `2 xx 10^13` | `2 xx 10^10` | `2 xx 10^7` | `2 xx 10^4` |
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Number, NAP-I4-NC11
The diameter of a pinhead is 0.0023 mm.
Which shows this measurement written in scientific notation?
| `2.3 xx 10^(−3)` | `2.3 xx 10^(−2)` | `2.3 xx 10^2` | `2.3 xx 10^3` |
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