Number Flashcards
What is a multiple?
The multiples of a number I results when that number is multiplied by each of the natural number.
What is a factor?
The factors of a number are the natural numbers that divide exactly into that number.
What Are natural numbers?
One, two, three, four, five
What is a integers?
-3, -2, -1, 0, 1, 2, 3
Eg. -3+-2= -5
Eg. -3+3= 0
Eg. -3-3= -6
What a powers?
Three to the power of five = 3×3×3×3×3= 243
What are powers of negative numbers?
If the power is odd, the answer is negative.
If the pallet is even, the answer is positive
Eg. (-4) to the power of three = -4 × -4 × -4 = -64
How do you simplify fractions?
4/10 = 2/5
How do I multiply fractions?
Multiply the numerators.
Multiply the denominators.
Eg. 3/4 × 2/9= 6/36= 1/6
How do I divide fractions and reciprocals?
The reciprocal of a fraction 3/4 is 4/3
A fraction and it’s reciprocal always multiply to 1
Eg. 3/4 × 4/3 = 12/12 = 1
How do I divide one friction?
To divide one fraction by the other, multiply the first fraction by the reciprocal of the second fraction.
Eg. 2/5 ÷ 6/5 = 2/5 × 5/6 = 10/3 = 1/3
How do I convert it at fraction into a percentage?
Eg 2/5 × 100 = 40%
How do I calculate a percentage?
Eg. Calculate 40% of $250
0.4×250 = 100
40/100 ×250 = 100
How do I increase and decrease percentages?
To increase $450 by 18%
One. 18/100×450 = 81
Two. Add 81 to 450 = $531 and that is the new price
To decrease $1200 by 20%
One. 20/100×1200 = 240
Two. Subtract $240 from $1200 = $960
Percentage changes?
Eg. Percentage change = ( 552-480 ) ÷ 480 × 100 = 15% increase
Eg. ( 105 - 99 ) ÷ 105 × 100 = 5.71
How do I calculate G.S.T?
Eg. 100 x 0.15 = 15 so 100 + 15 = 115
So 0.15 is to find how much is going to be added on and if you times 1.15 you will get the price including G.S.T
How do I calculate ratios?
With a ratio 8:12 it can be simplified to 2:3
Eg. Divide $1400 between two people in the ratio 2 to 5. Altogether there are seven parts.
Person 1 Gets 2/7 × 1400 = 400
Prison 2 gets 5/7 × 1400 = 1000
