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Exercise 4
Try these by looking at the table of squares you completed on the previous page and then
check your answers on your calculator
(a)
16
=
(a)
144
=
(a)
100
=
(a)
441
=
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The answers are 4, 12, 10, 21, 7, 13, 11, 19.
Let's now check that taking the square root neutralises squaring.
Try this on your calculator.
Find the square root of 3 squared that is,
The key strokes required are
The display should read 3
Because squaring and taking square roots are inverse operations, the order of the operatons
can be reversed and the number is unaffected.
So the square, of the square root of 3, should also equal 3
Try it on your calculator. The key strokes required are
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(a)
49
=
(a)
169
=
(a)
121
=
(a)
361
=
2
3
Mastering the Calculator using the Sharp EL-531LH
13
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