Number Pack 2 Flashcards
Negatives, powers, factors, multiples, primes
If you minus a negative number, what are you really doing
Adding
What is 7 - -3
10
If you multiply two numbers that have different signs what is the sign of the answer?
Negative
If you divide two numbers that have the same sign, what is the sign of the answer?
Positive
What is 3 x -4
-12
What is -9 ÷ -3
3
What does a little 2 next to a number mean?
To the power of two. Multiply the number by itself
What is 4 to the power of 2?
16
What is a square root?
The inverse of squaring. What number do you multiply by itself to get your number?
What is the symbol for square roots?
√
What is √25
5
What is a factor
A number you can divide an amount by with no remainder
What factors do every number have?
1 and itself
What are the factors of 20?
1,2,4,5,10,20
What is a multiple?
The times table of that number
What are the first 3 multiples of 20?
20,40,60
What is a prime number
A number that has EXACTLY 2 factors: 1 and itself
What is the first prime number
- It isn’t 1 because 1 only has 1 factor.
What is the first odd prime number
3 because it is prime and also not in the 2 times table
