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L.O.1 To be able to check with the inverse operation when using a calculator; to develop calculator skills and use a calculator effectively. Using a calculator work out and record in your books the answers to these: 21247 + 43578 56372 - 8657 387 x 257

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L.O.1

To be able to check with the inverse operation when using a calculator;

to develop calculator skills and use

a calculator effectively.


Using a calculator work out and record in your books the answers to these:

21247 + 43578

56372 - 8657

387 x 257

5952 ÷ 372

Q. How could you use the calculator to check the answers?


You can check the answer by using the inverse operation answers to these:.

LOOK…

21247 + 43578 = 64825

64825 – 43578 = 21247

56372 - 8657 = 47715

47715 + 8657 = 56372

387 x 257 = 99459

99459 ÷ 387 = 257

5952 ÷ 372 = 16.01882 16.01882 x 372 = 5952


Check these with a partner on a calculator: answers to these:

3496 x 27 = 90896

25398 + 76219 = 101617

467 x 286 = 133562

48602 ÷ 271 = 179.3432

63718 – 7534 = 56184

31263 ÷ 458 = 68.25983


L.O.2 answers to these:

To develop calculator skills and use a calculator effectively;

to choose and use appropriate number skills to solve work problems;

to check with the inverse operation when using a calculator.



Key in answers to these:£4.35 + £3.85

Do the sum

You should see8.2

Q. What is the answer to the question?

8.2really means£8.20

How can we check this answer?

What sum can we do using the inverse operation?

Try it.

We can do 8.2 - 4.35 or 8.2 - 3.85


Q. How would we enter answers to these:£6.30? and 85p?

Q. How would we enter six pounds and five pence? Is it £6.5

As we cannot used mixed units in the same calculation we must enter

£6.30 + 85p as 6.30 + 0.85


Try these. answers to these:

Remember to check each answer using the inverse calculation.


Volunteers needed… answers to these:

to explain what they did

when their checking showed

a wrong answer.

Q. Which was the trickiest question? Why?


LOOK… answers to these:

£3.95 + 75p + 95p = £173.95

Q. Can this answer be right?

What might have gone wrong?


By the end of this lesson the children should be able to:

Clear the display before entering a calculation;

use the [+];[-]; [x] and [÷] key and decimal point to calculate;

change an accidental wrong entry by using the [clear entry] key;

key in and interpret money calculations;

have a feel for the approximate size of an answer and check it by performing the inverse calculation.


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