Week 08 · Subtract within 100
Tuesday
Break a ten
// Take away tens and ones
⏱ about 15 min
Tuesday: Break a ten
Donnie has 52 acorns in his satchel.
He wants to share 27 with Riley.
He looks at the ones. "I have only 2 ones," he says.
"How can I take away 7?"
Bennie opens one bundle of ten.
"Now you have ten more ones," says Bennie. "Try again!"
Learn it: trade a ten for ten ones
Here is 52: 5 tens and 2 ones.
There are not enough ones to take away 7.
Break one ten into ten ones.
Now there are 4 tens and 12 ones.
Take away the ones: 12 - 7 = 5.
Take away the tens: 4 - 2 = 2 tens.
So 52 - 27 = 25.
BREAK A TEN
- Read the question.
- Tap your answer.
52 - 27 = ?
43 - 18 = ?
70 - 36 = ?
81 - 45 = ?
Another way: hop back to a ten
To find 53 - 6, hop back 3 to get to 50.
Then hop back 3 more to get to 47.
HOP BACK TO A TEN
- Read the question.
- Tap your answer.
53 - 6 = ?
64 - 8 = ?
92 - 5 = ?
DO WE BREAK A TEN?
- Read the question.
- Tap your answer.
64 - 29: are there enough ones?
87 - 34: are there enough ones?
35 - 18: are there enough ones?
Do you need to break a ten?
| Sentence | True or false? |
|---|---|
| One ten is the same as ten ones. | ? |
| 52 - 27 = 25 | ? |
| 61 - 34 = 37 | ? |
WHY THIS EXERCISE61 - 34 is 27. We break a ten first.
Try it
Put 3 piles of 10 beans and 2 extra beans out.
Take away 5 beans.
Did you need to open a pile of ten?
Take away 5 beans.
Did you need to open a pile of ten?
Word Spot: tell, their, car
Here are new sight words.
Look at each word. Say it. Spell it.
Tell: T-E-L-L.
Their: T-H-E-I-R.
Car: C-A-R.
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.
Can you ___ what you noticed?
The birds made ___ nest.
Buckle up in the ___.
You broke a ten! Tomorrow we learn why it works.