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As a teacher, to interest the children, some of their lessons I would call the "wonder of number". For very young children, with a simple pack of cards, one can place 10 at the top and then going down,
9+1 8+2 7+3 6+4 5+5 4+6 3+7 2+8 1+9
Children love patterns and order. They "get it" so easily, if bonds are set out in this way. They need to see the numbers at work with each other. This is harder to do now that calculators are the thing in classrooms. While there is a need for them, and many valuable tricks and games can be introduced using them, children should see these wonderful, orderly patterns on paper, right before their eyes, first. They should have the opportunity to work out magic squares, for instance, and only then should calculators be introduced. The slides below will fascinate young and old alike. Do enjoy it. Right at the end you will find a special message.
Now let us take a look at the following:
From a strictly Mathematical point of view, what equals 100%?