Subtracting
TRUE OR FALSE
Subtract from left to right?
FALSE (Subtracting from right to left.)
What is the rule for adding decimals?
Align the numbers vertically by the decimal point and fill in the remaining numbers with zeros.
TRUE OR FALSE
The decimal point is placed in the same position as in the numbers being subtracted?
TRUE
The decimal point in the result of a subtraction is placed in the same position ( vertically aligned) as in the numbers being `subtracted.Therefore,the statement is true.
How do we add decimals after aligning?
We add from right to left and regroup if necessary.
What do you do if the digit on top is smaller that the one below when subtracting?
Regroup/borrow from the next place value.
Ana is saving money to buy a video game.She had $9.80 and spent $4.50 on a book.How much money does Ana have now?
To find out how much money Ana has now, we need to subtract the amount she spent on the book from the amount she had initially.
9.89-4.50=5.30
Ana has $5.30 now.
TRUE OR FALSE
How do you align 3.24 and 1.4 to add them together?
The comma should be placed below the comma or otherwise the decimal points will not be aligned.
A submarine was 22.4 meters below sea level. It then ascended 6.9 meters.What was the final depth of the submarine?
Calculate the final depth by subtracting the distance ascended from the initial depth.
22.4-6.9=15.5
The submarine was at -15.5 meters (15.5 meters below sea level).
Heydi bought a box of cookies for $8.34 and a juice for $5.18.How much did Heydi pay in total?
Add the price of the cookies and the juice.
8.34+5.18=13.52
Heydi paid a total of $13.52
A player had 4.16 points in a game,but needed 7.20 points to advance to the next level. How many more points does ha need to advance to the next level?
Subtract the current points from the needed points.
7.20-4.16=3.04
He is 3.04 points short.
When adding or subtracting decimals, what is the most important aspect when aligning the numbers?
In addition and subtraction, it is necessary to fill in with zeros and align the decimal points.
Wendy had 1.25 meters of ribbon to make a bow.Her friend gave her 4.7 meters more to complete her project.How many meters of ribbon does Wendy have in total?
To find the total length of the ribbon, we need to add the length Wendy already had (1.25 meters) to the length her friend gave her (4.7 meters).
1.25 + 4.7 = 5.95
Wendy has a total of 5.95 meters of ribbon.
TRUE OR FALSE
12.6 - 7.4 = 5.2
TRUE ( Subtract as if they were integers)
12.6
- 7.4
= 5.2
How do you make sure your answer has the decimal in the correct place?
Place the decimal in the answer directly under the other decimals.
TRUE OR FALSE
45.8 - 23.3 = 22.4
FALSE
45.3
- 23.3
= 22
Elena had -$1.30 in her bank account because she owed money.The she had to pay an extra charge of $6.59 for a penalty.What is Elena's new balance?
Elena's new balance is -$7.89 because Elena's initial balance was negative, meaning she had a debt. To calculate the new balance, the additional charge is added to the initial balance.
A runner is training for a marathon.On the first day he ran 14.1 kilometers and on the second day he ran 31.21 kilometers.How many kilometers did he run in total during those two days?
To find the total distance the runner ran during the two days, we need to add the distances from each day.
14.1+31.21=45.31
The runner covered a total of 45.31 kilometers.
Lucia had a debt of $36.00.She paid $13.04 to reduce her debt.How much does Lucia still owe?
To find out how much still Owens, we need to subtract the amount she paid from her initial debt.
$36.00-$13.04=$22.96
Lucia still owes $22.96
Kate had 25.6 liters of water in a tank,and 12.3 liters were added.How much water is in the tank in total?
Add the initial amount of water and the amount added. 25.6+12.3=37.9
There are 37.9 liters of water in total.
A collector had 94.34 stamps in his collection. He decided to give 7.70 stamps to his friend. How many stamps did he have left?
Subtract the number of stamps given away from the original number of stamps.
94.34-7.70=86.64
He had 86.64 stamps left.
Where should the decimal point go in the answer?
In the same vertical position as the decimal above.
TRUE OR FALSE
When adding decimals, you can remove the decimal point, add as if they were whole numbers, and then replace it correctly?
TRUE (This works if you keep the decimal point in the correct position).
TRUE OR FALSE
When you borrow, you should always change the position of the decimal point.
FALSE (The decimal point never moves)
what should you check after adding decimals?
Check that the decimal point is in the correct place and there are no mistakes when regrouping.
TRUE OR FALSE
A gas tank held 75.6 L and 32.4 L were used.How much gas is left?
FALSE
correct answer:(43.2 L)
He should have aligned the decimal places of the two numbers.