how to write 3*100+2*10+5*1+3 *1 tents+1*1 hundredths+2*1 thousandths

well, just list the digits. You have the place values...

325.312

To write the given expression step-by-step, follow these steps:

Step 1: Multiply each number by its respective place value.
3 * 100 = 300
2 * 10 = 20
5 * 1 = 5
3 * 1 = 3
1 * 1 = 1
2 * 0.001 = 0.002

Step 2: Add up all the products.
300 + 20 + 5 + 3 + 1 + 0.002

Step 3: Simplify the expression.
300 + 20 + 5 + 3 + 1 + 0.002 = 329.002

Therefore, the simplified expression is 329.002.

To write the expression 3*100+2*10+5*1+3 *1 tents+1*1 hundredths+2*1 thousandths, follow the order of operations, also known as PEMDAS (Parentheses, Exponents, Multiplication and Division - from left to right, Addition and Subtraction - from left to right).

Step 1: Perform the multiplications within parentheses first, if any.
In this case, there are no parentheses.

Step 2: Perform any multiplications and divisions from left to right.
3 * 100 = 300
2 * 10 = 20
5 * 1 = 5
3 * 1 = 3
1 * 1 = 1
2 * 1 = 2

Step 3: Perform any additions and subtractions from left to right.
300 + 20 + 5 + 3 + 1 + 2 = 331

Therefore, the expression 3*100+2*10+5*1+3 *1 tents+1*1 hundredths+2*1 thousandths simplifies to 331.