Number Pack 3 Flashcards
HCF, LCM, Product of Primes, Rounding, Metric Units
HCF means what
Highest Common Factor. The biggest number that is a factor of all of the numbers in the question
What is the HCF of 4 and 10
2
LCM means what
Lowest Common Multiple. The first number that is in all the times tables of the numbers in the question
What is the LCM of 4 and 10
20
Product means what
Multiply
A prime factor is what
A factor of a number that is also a prime number
When you find the product of prime factors, what does your answer look like?
Something like 2x3x5 . The numbers in the answer are all prime numbers and they multiply to make the number in the question.
What is the rule about 5 you need to remember when rounding
If the value is 5 or higher in the place value you are rounding, you add 1 onto that number. If it is less than 5, you do not.
Round 14645 to the nearest 100
14600
Round 14645 to the nearest 1000
15000
What is a decimal place
A digit after the decimal point
Round 1.4645 to 2 decimal places
1.46
What is a significant figure
A digit. The higher the value of the digit, the more significant it is
What is the second significant figure of 14645
4000
Round 14645 to 1 significant figure
10000
How do you estimate correctly
Round all numbers to 1 significant figure. Then work out the calculation
Round 0.0014645 to 2 significant figure
0.0015
What does truncate mean
Chop off without rounding correctly
Truncate 1.999 to 2 decimal places
1.99
What are the metric units for length?
Millimetre, centimetre, metre, kilometre
What are the metric units for weight?
Milligram, gram, kilogram
What are the metric units for volume?
Millilitre, centilitre, litre
