FOURTH GRADE / MATHEMATICS / MULTIPLICATION of NATURAL NUMBERS 1.1
MATHEMATICS IS EASY. PROVIDED THAT ONE WORKS ENOUGH .
ENOUGH IS SKILL DEPENDENT, HAVE TO FIND "ENOUGH" RIGHT FOR YOU.
9x17 is being asked and to find 10x17 and to subtract 17 from it is the easiest way.
Multiply by 10 (add a 9 to right) and get half of this result .
If one of the multiplicands is the same, the greatest result is obtained with the greatest of the other mult.
The result of the last choice is about 500000 .
The closer the multiplicands , the greater the result . The square has the greatest area among rectangles having the same circumferences.
If 5xA+A=6xA=120 then A = 20 and ...
The addition of "000" to the end means mult. by 1000.
Multiplying one of the multiplicands by a number and dividing the other by the same number does not effect the result of a multiplication.
50 x 4 + 60 x 5 = 50 x 4 + 50 x 5 + 50 = 50 x 10 .
Trial and error is a plausible way of solving .
Depending on the specific way, the distance may cahnge .
Think as 200000000x27 + 40000000x27 + 8x000000x27 + 160000x27 + 3200x27 + 64x27 .
Treat as 111111 x (11 x 32) .
İkinci yöntemin nasıl çalıştığını anlamak kolaydır, uygulanabilir ve oldukça iyi bir denetim olur.
All multiples of nine including nine itself, should be dropped.
The use of rules should be done strictly.
Dropping multiples of three is of no use because 9=3x3 .
Since AB = 10xA + B , AB x A = (10xA + B)xA = 10xAxA + BxA . This is given to be 11 x A x A which ipmlies B = ...
Exapmles : For A=B=2 the equation is 22x2 = 11x2 and for A=B=3 it is 33x3 = 11x3x3
275x47 - 350 = ? .
26x27x28x29 = ? .
50x24 will be the number of windows at one side .
237 = 79 x 3 ; 45 = 15 x 3 ... .
According to ones, A is either 5 or 0 .
First apply the check given in Q. 13 .
Evaluate first the multiplications .
Have please a look at ry1 .
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