Question

170*2=340: 17дес.*2=34дес .=340будет . 245*2 это какой будет

Answer 1

245*2=490
24,5 дес *2 = 49 дес

Answer 2

It seems like you are trying to apply a pattern to the multiplication of numbers where the digits of each number are added together, multiplied by 2, and then the resulting digits are combined to get the answer. However, I must clarify that this pattern doesn't hold true for all numbers.

Let's see the example you provided step by step:

1. 170 * 2 = 340 (1 + 7 + 0) * 2 = 8 * 2 = 16, so the answer is 340.

2. 17дес. * 2 = 34дес. (1 + 7) * 2 = 8, and (3 + 4) * 2 = 14, so the answer is 34дес.

Now, let's apply the pattern to 245:

245 * 2 = ? (2 + 4 + 5) * 2 = 22

So, following the pattern, the result of 245 * 2 would be 22.