Wednesday
Wednesday: Add within 1,000
Hazel the Hedgehog has a jar of sunflower seeds for the birds.
"I have 256 seeds in this jar," she says.
Bennie brings his own bag. "I have 378 more."
"How many seeds is that together?" asks Hazel.
Bennie sets out his place value blocks on a flat rock.
"We add one place at a time," he says. "Ones, then tens, then hundreds."
Learn it: add one place at a time
Hazel has 256 seeds. That is 2 hundreds, 5 tens and 6 ones.
Bennie has 378 seeds. That is 3 hundreds, 7 tens and 8 ones.
Add the ones: 6 + 8 = 14.
Regroup 14 ones as 1 ten and 4 ones.
Add the tens: 5 + 7 + 1 = 13 tens.
Regroup 13 tens as 1 hundred and 3 tens.
Add the hundreds: 2 + 3 + 1 = 6 hundreds.
So 256 + 378 = 634.
Check with rounding.
256 is about 260, and 378 is about 380.
260 + 380 = 640. That is close to 634, so our sum makes sense.
- Read the question.
- Tap your answer.
- Read the question.
- Tap your answer.
Bennie counts 480 birds in spring and 365 in fall. How many birds?
The trail has 199 steps up and 602 steps across. How many steps?- Read the question.
- Tap your answer.
- Find each sum.
- Tap them from least to greatest.
| Sentence | True or false? |
|---|---|
| 256 + 378 = 634 | ? |
| 467 + 285 = 652 | ? |
| 145 + 230 = 375 | ? |
| 509 + 394 = 913 | ? |
Write down both page numbers.
Add them one place at a time: ones, tens, then hundreds.
Round both numbers to check your sum.
Super adding! Tomorrow Chris tells a story about subtracting.