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In the DIY Shop

Tutorials



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IN THE DIY SHOP

 

 

This astonishing method for multiplying numbers is
so easy because it works from left to right

Suppose you want to know the cost of 6 hinges at 73 cents each.

 

  • 73 × 6 = 438

    We first multiply the 7 by 6 to get 42.

    We then multiply the 3 by 6 to get 18.

            4 2 18 = 4 3 8

    The 1 in the 18 is mentally carried back to the 42
    to make it 43.

So any double figure number after the first involves
carrying the first figure to the left and adding it on.

  • Similarly 234 × 7 = 1638

    We get 2×7=14 then 3×7=21
    and 14 21 = 161

    Next we have 4×7=28, so 161 28 = 1638

  • 282 × 4 = 1128

    As 8 32 = 112 and 112  8 = 1128

  • And 43 × 7 = 2821 = 301 (28 becomes 30)



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<p><img src="/images/Tutorials/FWF/Exercise.jpg" width="43" height="43" align="absmiddle"><span id="QHI_FWF_In_The_DIY_Shop" class="QHC_TutorialButton">In The DIY Shop</span></p>

Mathematics is the
Queen of the Sciences
and Arithmetic the
Queen of Mathematics
GAUSS