Solve the addition problem:
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Solve the addition problem:
To solve the addition problem , we will use a step-by-step column addition method:
Therefore, the sum of the numbers is .
The correct answer choice is:
If we have 85 blocks in total, how many blocks will remain if we remove 4 tens and 1 one?
When you add digits and get 10 or more, you write the ones digit below and carry the tens digit to the next column. Think of it as borrowing in reverse!
Place value matters! Ones must be added to ones, tens to tens. If numbers aren't aligned properly, you'll add the wrong digits together and get an incorrect answer.
Remember: when you get a two-digit sum like 10, the right digit (0) stays in that column, and the left digit (1) moves to the next column on the left.
Try adding in reverse order: instead of 12 + 58, calculate 58 + 12. You should get the same answer! This helps catch careless mistakes.
You could use mental math strategies like: 12 + 58 = 12 + 50 + 8 = 62 + 8 = 70. But column addition is more reliable for larger numbers!
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