Maths Quiz - Level 7-8 Algebra - Powers (Answers)
Remember those pesky little numbers called powers that turned out to be powerful little numbers? I'm sure you do - they play a key role in KS3 Maths, especially when working on algebra.
Powers are the small numbers written above and to the right of other numbers. You'll be most familiar with squares (2) and cubes (3) but any number can be a power. For example, 1 million (1,000,000) is 106 (with ten, the number of zeroes is a clue to its power).
So, just to make sure that you are comfortable with powers, here is another quiz on the subject. It's designed to give you some more practise at using algebra and powers together. Take your time and read each question carefully before submitting your answers. And don't forget to read the helpful comments after each question - they can help to clear up anything you were unsure of. Good luck!
|
|
||||||||||||||||||||||||
|
|
||||||||||||||||||||||||
|
|
||||||||||||||||||||||||
|
|
||||||||||||||||||||||||
|
|
You can find more about this topic by visiting BBC Bitesize - Powers
9b = 9 x 9 = 81. In a question such as this you have to work out all the answers in order to determine which is correct
|
If a = 2 then a2 = 4
621 + 4 = 625 Next you have to work out which number to the power of 4 = 625. This might involve some trial and error! |
||||||||||||||||||||||||
27 + 81 + 243 = 351
|
When you are given 10 to the power of something, remember that the power will be the number of zeros that follow the 1. 102 = 100 (2 zeros); 105 = 100,000 (5 zeros)
|
||||||||||||||||||||||||
By using a calculator we found the answer was 68,719,476,736. Without a calculator it might have taken us a week to work out!
|
12 x 98
|
||||||||||||||||||||||||
Experiment with different values for x until you find the number that fits
|
169 - 169 = 0
|
||||||||||||||||||||||||
All the incorrect answers have the value of 139
|
An easy one to reward you for finishing the quiz! Strictly speaking, it should be plus or minus 3
|