Calculate Total: Adding £10.30 and £17.10 in Shopping Context

Q: Why do I need to line up the decimal points?

Lining up decimal points ensures you're adding like place values - tenths to tenths, ones to ones, etc. Without proper alignment, you'll get the wrong total!

Q: What if the decimal numbers have different lengths?

You can add invisible zeros to make them the same length. For example, treat £10.30 as £10.30 and £17.10 as £17.10 - they're already the same length here!

Q: Should I include the pound sign in my calculation?

Focus on the numbers first: 10.30 + 17.10 = 27.40. Then add the pound sign to your final answer: $ \pounds27.40 $

Q: How can I check if £27.40 is reasonable?

Use mental estimation: £10 + £17 = £27, so £27.40 is very close and makes sense. Always do a quick estimate to catch major errors!

Decimal Addition with Money Values

Chris buys apples costing $\pounds10.30$ and grapes that cost $\pounds17.10$ .

How much does Chris pay in total?

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations

00:10 Let's solve this problem together.

00:14 We'll use long addition to figure it out, step by step.

00:24 Remember, each time we add, take your time to calculate, and write it down.

00:38 Great job! And that's how we solve this problem.

Step-by-step written solution

Follow each step carefully to understand the complete solution

Understand the problem

Chris buys apples costing $\pounds10.30$ and grapes that cost $\pounds17.10$ .

How much does Chris pay in total?

Step-by-step solution

To work out how much Chris pays in total, we need to add the cost of the apples to the cost of the grapes as follows:

$10.3\\+17.1$

This gives us the answer:

$27.4$

Final Answer

$\pounds27.40$

Key Points to Remember

Essential concepts to master this topic

Rule: Line up decimal points when adding money amounts
Technique: Add $10.30 + 17.10$ by aligning the decimal points
Check: Total should be reasonable: £27.40 makes sense for both items ✓

Common Mistakes

Avoid these frequent errors

Not aligning decimal points properly
Don't write 10.30 + 17.10 without lining up decimals = wrong place values! This leads to adding tenths to ones or hundreds to tens. Always align decimal points vertically before adding.

Practice Quiz

Test your knowledge with interactive questions

Which decimal number is greater?

FAQ

Everything you need to know about this question

Why do I need to line up the decimal points?

Lining up decimal points ensures you're adding like place values - tenths to tenths, ones to ones, etc. Without proper alignment, you'll get the wrong total!

What if the decimal numbers have different lengths?

You can add invisible zeros to make them the same length. For example, treat £10.30 as £10.30 and £17.10 as £17.10 - they're already the same length here!

Should I include the pound sign in my calculation?

Focus on the numbers first: 10.30 + 17.10 = 27.40. Then add the pound sign to your final answer: $\pounds27.40$

How can I check if £27.40 is reasonable?

Use mental estimation: £10 + £17 = £27, so £27.40 is very close and makes sense. Always do a quick estimate to catch major errors!

What if I forget to carry over when adding?

In this problem, there's no carrying needed since 3 + 1 = 4 and 0 + 0 = 0. But always double-check each column from right to left!

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