Addition with Tens and Units: Finding Components of 73

Which addition exercise using tens and units results in 73?

To solve this problem, we'll consider the decimal structure of the number 73, which involves tens and units:

• Step 1: Identify the tens digit in 73. The number 73 has 7 tens, corresponding to the number 70.
• Step 2: Identify the units digit in 73. The number 73 has 3 units, corresponding to the number 3.
• Step 3: Formulate the addition exercise using these components. The tens and units can be added as $70 + 3$.

Thus, the addition exercise using tens and units which results in 73 is $70 + 3$.

If we look at the provided choices, we see that choice 3 ($70 + 3$) correctly represents this breakdown.

Therefore, the solution to the problem is $70 + 3$.