Ian multiplied a number by 5. He then multiplied that product by 2. What digit is in the ones place of the final product
To find the digit in the ones place of the final product, we need to follow Ian's steps:
1. Assume the initial number is x.
2. Ian multiplied the number x by 5, giving 5x.
3. He then multiplied the product (5x) by 2, resulting in 2 * 5x, or 10x.
From this, we can see that the ones digit of the final product will always be 0, regardless of the value of x. The reason is that multiplying any number by 10 gives a product with a zero in the ones place.