Monday
Monday: Add decimals
Bruce the Bobcat waits at the Maple Bridge challenge stop, his red headband bright in the sun.
"Today the trail has two parts," he says. "The first part is 1.25 kilometers long."
"The second part is 0.6 kilometers long. How far is the whole walk?"
Bennie the Bear sets down his basket of stones and picks up a stick.
He writes the two numbers in the dirt, one under the other.
"Let us line up the decimal points first," Bennie says.
"Then ones sit under ones, and tenths sit under tenths."
Learn it: line up the places
The decimal point sits between the ones place and the tenths place.
To add decimals, line up the decimal points first.
Then add like places: hundredths with hundredths, tenths with tenths, ones with ones.
Bennie writes 0.6 as 0.60, so both numbers have a hundredths digit.
Hundredths: 5 + 0 = 5. Tenths: 2 + 6 = 8. Ones: 1 + 0 = 1.
So 1.25 + 0.60 = 1.85. The whole walk is 1.85 kilometers.
- Read the question.
- Tap your answer.
Learn it: ten hundredths make a tenth
Add 0.75 + 0.48.
Hundredths: 5 + 8 = 13 hundredths. That is 1 tenth and 3 hundredths.
Tenths: 7 + 4 + 1 = 12 tenths. That is 1 one and 2 tenths.
So 0.75 + 0.48 = 1.23.
- Read the question.
- Tap your answer.
- Read the question.
- Tap your answer.
What decimal does the grid show?
What decimal does the grid show?- Think about how Bennie adds decimals.
- Tap the steps in order.
| Sentence | True or false? |
|---|---|
| 1.25 + 0.6 = 1.85 | ? |
| 0.75 + 0.48 = 1.13 | ? |
| 2.5 + 0.25 = 2.75 | ? |
| 3.4 + 1.6 = 5 | ? |
One centimeter is 0.01 meter, and ten centimeters is 0.1 meter.
Measure a spoon and a pencil in centimeters.
Write each length in meters, like 0.15 meter.
Add the two lengths to find how long they are end to end.
Great adding! Tomorrow Bruce brings a subtraction challenge.