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प्रश्न
20 × 3 is a multiple of 3 if the digit × is ______ or ______ or ______.
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उत्तर
20 × 3 is a multiple of 3 if the digit × is 1 or 4 or 7.
Explanation:
We know that, if a number is a multiple of 3, then the sum of its digits is again a multiple of 3, i.e. 2 + 0 + x + 3 is a multiple of 3.
x + 5 = 0, 3, 6, 9, 12, 15 But, x is a digit of the number 20 × 3.
x can take values 0, 1, 2, 3, ........ 9.
⇒ x + 5 = 6 or 9 or 12
Hence, x = 1 or 4 or 7
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संबंधित प्रश्न
Given an example of a number which is divisible by both 4 and 8 but not by 32.
Use the same rule to fill the hexagons below.
Now you also make your own magic hexagons.
Are they equal?
Now you try and change these numbers into special numbers —
273
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Fill in the blank space in the same way.
