Use a prime factor tree. - correct_answHow do you write a number as a product
of primes? e.g. 20
1. Write as a product of primes.
2. Use a venn diagram.
3. Multiply ALL the numbers in the venn diagram. - correct_answHow do you find
the LCM of two numbers? e.g. LCM of 20 and 70
1. Write as a product of primes.
2. Use a venn diagram.
3. Multiply the numbers in the middle. - correct_answHow do you find the HCF of
two numbers?
e.g. HCF of 20 and 70
Multiply the number by itself and by itself again.
5 x 5 x 5 = 125 - correct_answHow do you cube a number? e.g. 5³
,3 x 3 x 3 x 3 = 81 - correct_answHow do you work out 3>?
Find what number would be cubed to get the number you are cube rooting. =√27
= 3 - correct_answHow do you cube root a number? e.g. =√27
y⁸ (add the powers) - correct_answWhat is y= x y?
y@ (subtract the powers) - correct_answWhat is y⁸ ÷ y<
y⁸ (multiply the powers) - correct_answWhat is (y<)>
Round all numbers to 1 significant figure and then calculate.
e.g. 198.7 x 0.203 ≈ 200 x 0.2 = 40 - correct_answHow do you estimate a
calculation? e.g. 198.7 x 0.203
2, 3, 5, 7, 11, 13, 17, 19, 23, 29 - correct_answWhat are the first 10 prime
numbers?
1, 4, 9, 16, 25, 36, 49, 64, 81, 100 - correct_answWhat are the first 10 square
numbers?
1, 8, 27, 64, 125 - correct_answWhat are the first 5 cube numbers?
, Positive.
e.g. 8 x 3 = 24 - correct_answPositive X Positive
Negative.
e.g. 5 x -3 = -15 - correct_answPositive X Negative
Negative.
-10 x 2 = -20 - correct_answNegative X Positive
Positive.
-4 x -7 = 28 - correct_answNegative X Negative
Positive.
1000 ÷ 2 = 500 - correct_answPositive ÷ Positive
Negative.
40 ÷ -4 = -10 - correct_answPositive ÷ Negative
Negative.
-8 ÷ 4 = -2 - correct_answNegative ÷ Positive
of primes? e.g. 20
1. Write as a product of primes.
2. Use a venn diagram.
3. Multiply ALL the numbers in the venn diagram. - correct_answHow do you find
the LCM of two numbers? e.g. LCM of 20 and 70
1. Write as a product of primes.
2. Use a venn diagram.
3. Multiply the numbers in the middle. - correct_answHow do you find the HCF of
two numbers?
e.g. HCF of 20 and 70
Multiply the number by itself and by itself again.
5 x 5 x 5 = 125 - correct_answHow do you cube a number? e.g. 5³
,3 x 3 x 3 x 3 = 81 - correct_answHow do you work out 3>?
Find what number would be cubed to get the number you are cube rooting. =√27
= 3 - correct_answHow do you cube root a number? e.g. =√27
y⁸ (add the powers) - correct_answWhat is y= x y?
y@ (subtract the powers) - correct_answWhat is y⁸ ÷ y<
y⁸ (multiply the powers) - correct_answWhat is (y<)>
Round all numbers to 1 significant figure and then calculate.
e.g. 198.7 x 0.203 ≈ 200 x 0.2 = 40 - correct_answHow do you estimate a
calculation? e.g. 198.7 x 0.203
2, 3, 5, 7, 11, 13, 17, 19, 23, 29 - correct_answWhat are the first 10 prime
numbers?
1, 4, 9, 16, 25, 36, 49, 64, 81, 100 - correct_answWhat are the first 10 square
numbers?
1, 8, 27, 64, 125 - correct_answWhat are the first 5 cube numbers?
, Positive.
e.g. 8 x 3 = 24 - correct_answPositive X Positive
Negative.
e.g. 5 x -3 = -15 - correct_answPositive X Negative
Negative.
-10 x 2 = -20 - correct_answNegative X Positive
Positive.
-4 x -7 = 28 - correct_answNegative X Negative
Positive.
1000 ÷ 2 = 500 - correct_answPositive ÷ Positive
Negative.
40 ÷ -4 = -10 - correct_answPositive ÷ Negative
Negative.
-8 ÷ 4 = -2 - correct_answNegative ÷ Positive
