Andy goes on a three-day trip.
On day one, he travels km.
On day two, he travels km.
On day three, he travels km.
How many kilometres does Andy travel in total over the three days?
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Andy goes on a three-day trip.
On day one, he travels km.
On day two, he travels km.
On day three, he travels km.
How many kilometres does Andy travel in total over the three days?
To work out how many kilometres Andy walks in total, we need to add up the distances he walks each day in the following manner:
First we will add the digits after the decimal point accordingly:
Since these add up to 10, we can replace the tenths digit with a 0 and add a units digit to the number.
Now, simply add up the units digits of the number (the original digits before the decimal place plus our new one):
In total, Andy walks 5 km (5.0 km).
Which decimal number is greater?
Lining up decimal points ensures you're adding like place values: tenths to tenths, units to units. Without alignment, you might add a tenth to a unit, giving the wrong answer!
When tenths exceed 9 (like 2+1+7=10), write down 0 in the tenths place and carry 1 to the units column. This is called regrouping or carrying over.
Yes, but if your answer is a whole number like 5.0, you can write it as either 5 or 5.0 - both are correct!
Try rounding each number to the nearest whole number first: 1+2+2=5. Your exact answer should be close to this estimate!
Add zeros as placeholders! For example, treat 1.2 as 1.20 when working with 1.75. This makes alignment easier and prevents mistakes.
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