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Level 3-4 Algebra - Powers
Powers – it sounds important, right? Well, they are a big deal in KS3 Maths, especially in algebra. Powers are those small numbers hanging out on the top right of other numbers. Don't let their size fool you – powers pack a punch!
You might hear them called powers, indices, or exponents – but it's all the same cool stuff. Powers are like magic shortcuts, showing a number multiplied by itself. Instead of writing 2 x 2 x 2, we just say 23. See, powers save time and space!
Quizzes: Your Ticket to Fun Learning. Dive In
1 .
If a2 = 25, what is the value of a4?
29
50
125
625
a must be 5. a4 therefore must be 5 x 5 x 5 x 5
2 .
111 - x3 = -105. What is the value of x?
3
6
9
12
3 .
In the equation x3 + y2 - 6 = 51, we are told that the value of x is 2. What is the value of y?
7 or -7
8 or -8
9 or -9
11 or -11
Experiment with different values for y until you find the correct answer
4 .
Which of these gives the largest value?
4 + 6
4 x 6
46
64
64 = 1,296 whilst 46 = 4,096. We Googled it - did you?
5 .
19 is 1. What is 91?
1
9
18
19
6 .
To what power does 6 need to be raised to give a value of 216?
2
3
4
5
63 = 6 x 6 x 6
7 .
If a = 4 and b = 5, which of these is the largest value?
4a2
3b3
a + a + a + a
b + b + b + b + b + b + b + b + b + b + b + b
3b3 = 3 x 125 = 375
8 .
If a = 3 and b = 10, what is the difference between a4 and b2?
17
19
21
23
a4 = 3 x 3 x 3 x 3 = 81
9 .
How would you work out the value of 36?
3 + 6
6 + 3
3 x 6
3 x 3 x 3 x 3 x 3 x 3
Answer is 729
10 .
If x = 2 and y = 8, what is the answer to 8y / x4?
2
4
8
16
Be careful not to mix up multiplying numbers together (as in 8y) when finding the value of numbers with powers (as in 24)
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