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So:<br />
� 5 + 3 = 20 + 21 = 41<br />
7 4 28 28<br />
Subtracting is just as easy: multiply crosswise as<br />
before, but then subtract:<br />
� 6<br />
-<br />
2<br />
=<br />
18 - 14<br />
=<br />
4<br />
7 3 21 21<br />
Try a few:<br />
www.classtopper.com<br />
1) 4 + 1 = 2) 1 + 1 = 3) 2 + 2 =<br />
5 6 3 4 7 3<br />
4) 4 - 1 = 5) 1 - 1 = 6) 8 - 9 =<br />
5 6 4 5 3 5<br />
19<br />
. . . nature is the realisation<br />
of the simplest<br />
conceivable mathematical<br />
ideas.<br />
EINSTEIN
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