Solve for the Missing Addend in 1.3 + ? = 1.4

Q: Why do I subtract to find a missing number in addition?

Think of it like this: if you have 1.4 total items and you already know 1.3 of them, how many are left? You subtract! Addition and subtraction are inverse operations - they undo each other.

Q: How do I line up the decimal points when subtracting?

Always write the decimals vertically with decimal points aligned:1.4-1.3____0.1This prevents errors with place values!

Q: What if the missing addend is the first number instead?

The process is the same! For $ ? + 1.3 = 1.4 $, you still calculate $ 1.4 - 1.3 = 0.1 $. Addition is commutative, so order doesn't matter for the missing addend.

Q: Can the missing addend be larger than the other addend?

Absolutely! For example, in $ 0.2 + ? = 1.4 $, the missing addend would be $ 1.4 - 0.2 = 1.2 $, which is larger than 0.2.

Q: How can I check if my answer is correct?

Simply substitute your answer back into the original equation. If $ 1.3 + 0.1 = 1.4 $, then you know 0.1 is correct! This verification step catches calculation mistakes.

Missing Addend Problems with Decimal Numbers

Fill in the missing value (?):

$1.3+?=1.4$

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Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

Fill in the missing value (?):

$1.3+?=1.4$

Step-by-step solution

To solve the problem, we need to find the unknown number that when added to 1.3 results in 1.4. This is written mathematically as $1.3 + ? = 1.4$ .

We'll solve this by following these steps:

Step 1: Understand the operation needed. We have a simple addition equation, where we are trying to find the unknown addend.
Step 2: Rearrange the equation to solve for the unknown number. According to properties of numbers, if $1.3 + ? = 1.4$ , then the missing number can be found by subtracting 1.3 from 1.4.
Step 3: Perform the subtraction: $1.4 - 1.3 = 0.1$ .

After performing the calculation, we find that the unknown number is $0.1$ .

Therefore, the solution to the problem is $0.1$ .

Final Answer

0.1

Key Points to Remember

Essential concepts to master this topic

Inverse Operations: Use subtraction to find missing addend in addition problems
Technique: Subtract known addend from sum: $1.4 - 1.3 = 0.1$
Check: Add your answer to known addend: $1.3 + 0.1 = 1.4$ ✓

Common Mistakes

Avoid these frequent errors

Adding instead of subtracting to find missing addend
Don't add 1.3 + 1.4 = 2.7! This gives you the wrong operation and a much larger number. When finding a missing addend, the sum is always larger than the known addend. Always subtract the known addend from the sum.

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FAQ

Everything you need to know about this question

Why do I subtract to find a missing number in addition?

Think of it like this: if you have 1.4 total items and you already know 1.3 of them, how many are left? You subtract! Addition and subtraction are inverse operations - they undo each other.

How do I line up the decimal points when subtracting?

Always write the decimals vertically with decimal points aligned:
1.4
-1.3
____
0.1
This prevents errors with place values!

What if the missing addend is the first number instead?

The process is the same! For $? + 1.3 = 1.4$ , you still calculate $1.4 - 1.3 = 0.1$ . Addition is commutative, so order doesn't matter for the missing addend.

Can the missing addend be larger than the other addend?

Absolutely! For example, in $0.2 + ? = 1.4$ , the missing addend would be $1.4 - 0.2 = 1.2$ , which is larger than 0.2.

How can I check if my answer is correct?

Simply substitute your answer back into the original equation. If $1.3 + 0.1 = 1.4$ , then you know 0.1 is correct! This verification step catches calculation mistakes.

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