7.2 Square roots Earlier you met the square function and on most calculators the square root is the second function on the same key. Look to see if this is the case for your calculator and check the calculator handbook on how to use this function. In many cases you will need to press the square root key before the number, instead of afterwards, as for the square key. This is the case on the TI-84. Check that you can find the square root of 25 and of 0.49 (you should get 5 and .7 respectively). Now find
2.3 Some calculator conventions Your calculator will interpret the order in which you press the keys, in a particular way. For example if you press the key sequence: 2
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3 Aims The aim of this section is to help you to think about how you study mathematics and consider ways in which you can make your study more effective.
Pressing onwards Work through Sections 1.6 and 1.7 of the Calculator Book, using the method suggested above of glancing ahead-pressing on-glancing back, if you find it useful. A num Maths as others see it Video: Click to view clip on Whittington Hospital in north London
Activity 15