What times what equals 20?
Understand the Problem
The question is asking for pairs of numbers that when multiplied together yield the product of 20. This requires exploring multiplication and identifying possible factors of 20.
Answer
(1, 20), (2, 10), (4, 5), (-1, -20), (-2, -10), (-4, -5)
Answer for screen readers
Possible pairs of numbers that multiply to get 20 are (1, 20), (2, 10), (4, 5), (-1, -20), (-2, -10), (-4, -5)
Steps to Solve
- Identify factors of 20
To find pairs of numbers that multiply to 20, we need to identify its factors.
- List factor pairs
List all pairs of numbers that, when multiplied together, result in 20.
$$1 \times 20 = 20$$ $$2 \times 10 = 20$$ $$4 \times 5 = 20$$
- Identify negative factor pairs
Also, consider pairs of negative numbers, because multiplying two negative numbers also gives a positive result.
$$-1 \times -20 = 20$$ $$-2 \times -10 = 20$$ $$-4 \times -5 = 20$$
Possible pairs of numbers that multiply to get 20 are (1, 20), (2, 10), (4, 5), (-1, -20), (-2, -10), (-4, -5)
More Information
These pairs include both positive and negative numbers, since multiplying two negative numbers results in a positive product.
Tips
A common mistake is to forget about or overlook the negative factor pairs.
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