Addition Problem: Calculate 31 + 50 Units

Two-Digit Addition with Carrying

Add fifty units to the number 31.

What is the resulting number?

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Step-by-step written solution

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1

Understand the problem

Add fifty units to the number 31.

What is the resulting number?

2

Step-by-step solution

To solve this problem, we'll perform simple addition:
Step 1: Identify the numbers to be added, which are 31 and 50.
Step 2: Calculate the sum: 31+50 31 + 50 .

Let's perform the calculation:

  • Start the addition from the rightmost digit (units place).
  • In the units place, add 1 (from 31) and 0 (from 50), giving us 1.
  • In the tens place, add 3 (from 31) and 5 (from 50), which gives us 8.

Since there's nothing to carry over, the sum directly gives us the resulting number. Thus, 31+50=81 31 + 50 = 81 .

Therefore, the resulting number when adding fifty units to the number 31 is 81 81 .

3

Final Answer

81 81

Key Points to Remember

Essential concepts to master this topic
  • Rule: Add digits column by column from right to left
  • Technique: Units place: 1 + 0 = 1, tens place: 3 + 5 = 8
  • Check: Verify by counting up from 31: 32, 33... 81 ✓

Common Mistakes

Avoid these frequent errors
  • Adding in wrong order or forgetting place values
    Don't add 31 + 50 as 3 + 1 + 5 + 0 = 9! This ignores place values and gives completely wrong results. Always align numbers by place value and add column by column starting from the rightmost digit.

Practice Quiz

Test your knowledge with interactive questions

If we have 67 blocks in total, how many blocks will remain if we remove 5 tens and 4 ones?

FAQ

Everything you need to know about this question

Why do we start adding from the right side?

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We start from the units place (rightmost digit) because if there's any carrying needed, it flows from right to left. This ensures we handle all place values correctly!

What if I get confused about which numbers to add?

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Line up the numbers vertically so the units align with units and tens align with tens. This makes it much easier to see which digits belong together!

How can I check my addition without a calculator?

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Method 1: Add in reverse order (50 + 31). Method 2: Count up from the larger number. Both should give you 81 81 !

What does 'adding fifty units' mean exactly?

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Adding fifty units means adding the number 50. The word 'units' just emphasizes we're adding 50 whole number quantities to our starting number of 31.

Is there a faster way to add numbers ending in zero?

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Yes! When adding to numbers ending in 0, you can think: 31 + 50 is like 31 + 5 tens = 31 + 50. The units digit stays the same, and you just add to the tens place.

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