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Q: What is x plus 423?

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x + 2x + 423 = 3x + 423

x + 361 = 555 + 423 x = 555 + 423 - 361 x = 617

532 + 629 + 423 = 1,584

1, 3, 9, 47, 141, 423: (1 x 423, 3 x 141, 9 x 47)

423 + 7 = 430

3 x 3 x 47 = 423

3 x 3 x 47 = 423

423 = 3 x 3 x 47

It is: 155+268 = 423

1 x 423 | 3 x 141 | 9 x 47

1 x 423, 3 x 141, 9 x 47.

The prime factors of 423 are: 3 x 3 x 47

423 141,3 47,3,3 3 x 3 x 47 = 423

48,395 multiplied by 423 = 20,471,085

423 is a composite number. Its prime factorisation is 3 x 3 x 47.

67:40

6 + (23 424 243 423 423 243 244 224 242 424) = 23 424 243 423 423 243 244 224 242 430

There can be many different answers. One of them is 42.3 x 10 = 423

512 plus 423 = 935

423 seconds is seven minutes three seconds. 423 - 3 = 420 = 60 x 7

84600

423 is a composite number because it has more factors than one and itself. Its prime factorisation is 3 x 3 x 47.

I round one of the numbers (usually the larger one but either one works) up or down to the nearest number that is easy to multiply in my head. Like this: 423 x 12 Becomes: 425 x 12 Then I would say that if 425 x 12 = ___, then 850 x 6 = ____ too. Because 850 = 425 x 2 and 6 = 12 / 2 And if 850 x 6 = ____, then 1700 X 3 = ____ also. 1700 x 3 = (1000 x 3) + (700 x 3) = 3000 + 2100 = 5100 So, 425 x 12 = 5100. But, we started with 423 not 425. (425 x 12) - ((425-423) x 12) = 423 x 12 425 - 423 = 2 So, we need to multiply the difference (2) by 12 and subtract that from the 5100 to get the real answer. 2 x 12 = 24 5100 - 24 = 5100 - 25 + 1 = 5076 423 x 12 = 5076 Ta Da! Another way, is to break one into easy to use numbers (12 is good for this) and skip the rounding step. But, sometimes there is no easy split (3746 x 5317) and then the rounding works better. But, here is the split method (I also used it above.) 423 x 12 = (423 x 10) + 423 x 2 423 x 10 = 4230 and 423 x 2 = 846 4230 + 846 = 5076 With practice you will get faster at this and you will even be able to hold a conversation while doing the math. Then everyone will think you are a genius!

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