Week 07 · Add within 100
Wednesday
Add three or four numbers
// Tens with tens, ones with ones
⏱ about 15 min
Wednesday: Add three or four numbers
Riley opens his bag of puzzle pieces.
"Four friends gave me pieces," he says.
"Ferris gave 14 and Hazel gave 21."
"Lucy gave 30 and Bennie gave 25."
"How many pieces is that?"
Bennie rubs his chin. "Let us add all the tens first."
"Then we add all the ones."
Learn it: tens first, then ones
14 + 21 + 30 + 25 = ?
Add the tens: 10 + 20 + 30 + 20 = 80.
Add the ones: 4 + 1 + 0 + 5 = 10.
Put them together: 80 + 10 = 90.
Look for numbers that make a ten.
In 16 + 24, the 6 and 4 make a ten.
ADD THREE NUMBERS
- Read the question.
- Tap your answer.
12 + 23 + 31 = ?
16 + 24 + 30 = ?
25 + 15 + 18 = ?
33 + 41 + 12 = ?
ADD FOUR NUMBERS
- Read the question.
- Tap your answer.
14 + 21 + 30 + 25 = ?
10 + 20 + 15 + 22 = ?
11 + 12 + 13 + 14 = ?
FIND THE PAIRS THAT MAKE TEN
- Read the question.
- Tap your answer.
In 27 + 13 + 40, which ones make a ten?
In 18 + 31 + 22, which ones make a ten?
ADD 14 + 21 + 30 + 25
- Think about how Bennie adds.
- Tap the steps in order.
1First
2Next
3Then
4Last
Add the tens, then the ones.
| Sentence | True or false? |
|---|---|
| 12 + 23 + 31 = 66 | ? |
| 10 + 20 + 30 + 40 = 90 | ? |
| We can add the tens first. | ? |
WHY THIS EXERCISE10 + 20 + 30 + 40 is 100, not 90.
Try it
Ask three people at home to pick a number up to 30.
Add all three numbers on paper.
Add the tens first, then the ones.
Add all three numbers on paper.
Add the tens first, then the ones.
Word Spot: often, important, until
Here are new sight words.
Look at each word. Say it. Spell it.
Often: O-F-T-E-N.
Important: I-M-P-O-R-T-A-N-T.
Until: U-N-T-I-L.
FIND THE WORD
- Listen to the word.
- Tap it.
Find the word you hear.
Find the word you hear.
Find the word you hear.
Find the word you hear.
FILL THE GAP
- Listen to the sentence.
- Tap the missing word.
How ___ do you read?
Sleep is ___ for your body.
We played ___ it got dark.
Wonderful adding! Tomorrow Chris tells a story with sums.