maths Flashcards
3 less than p?
p - 3, imagine p is a number
z + 3 is different or the same to 3 + z ?
different, imagine z is a number
83.07718 to 2 dcp?
83.08
0.709 to one significant figure?
0.7
rule for 0 when dealing with significant figures?
the first 0 is not significant
a x a or b x b ?
a x a = a², b x b = b²
km in m, m in cm, cm in mm, m in mm?
1km = 1000m
1m = 100cm
1cm = 10mm
1m = 1000mm
two minuses make a plus, rules for all the others?
all the others make a minus, (plus and minus, minus and plus) apart from plus and plus and minus and minus
two minuses make a ____?___
two minuses make a plus, make sure to box off all numbers
-4 x -4?
16 because two negatives = positive result
(-54) / (-9) ?
6, ignore symbol in middle when boxing off
8 x (-4)?
32, positive and negative has a negative result.
-2 + (-3) ?
-2 + (-3) = -5
-6 - (-8) ?
=2, two minuses next to each other mean plus so minus six plus minus eight is two.
5 + -5 ?
0
5 - 8+ 1?
-2, box off and bodmas
7 - 9 - 2?
-4, box off the numbers
-10 + 3 + 13?
=6
____ +2 = -1
missing number is -3, use inverse operation
(-2)³ ?
= -2 x -2 = 4, 4(+=–) = 4x-2 = 8, final answer is eight
prime number meaning?
a number that is only divisible by one and itself
hcf of 25a² and 21a²?
7a
hcf of 36y²z and 14yz²?
2yz
142mm to nearest cm, error interval?
141.5≤x<142.5
