Week 08 · Subtract within 100
Monday
Take away tens, then ones
// Take away tens and ones
⏱ about 15 min
Monday: Take away tens, then ones
Donnie the Deer walks slowly through the meadow with his satchel.
He has gathered 58 bright leaves.
"I want to give 23 leaves to Bennie," he says softly.
"How many will I have left?"
Bennie the Bear sets out the leaves in bundles of ten.
"Take away tens, then ones," he says.
Learn it: tens from tens, ones from ones
Donnie has 5 tens and 8 ones. That is 58.
He gives away 23. That is 2 tens and 3 ones.
Take away the tens: 50 - 20 = 30.
Take away the ones: 8 - 3 = 5.
Put them together: 30 + 5 = 35.
Donnie has 35 leaves left.
TAKE AWAY TENS
- Read the question.
- Tap your answer.
70 - 30 = ?
90 - 50 = ?
60 - 10 = ?
TAKE AWAY TENS AND ONES
- Read the question.
- Tap your answer.
58 - 23 = ?
76 - 41 = ?
89 - 53 = ?
67 - 25 = ?
HOW BENNIE SUBTRACTS
- Think about how Bennie takes 23 from 58.
- Tap the steps in order.
1First
2Next
3Then
4Last
Take away the tens, then the ones.
| Sentence | True or false? |
|---|---|
| 58 - 23 = 35 | ? |
| 97 - 45 = 62 | ? |
| 46 - 26 = 20 | ? |
WHY THIS EXERCISE97 - 45 is 52, not 62.
Try it
Make 4 piles of 10 spoons or blocks.
Add 6 more. That is 46.
Take away 1 pile and 2 more.
How many are left?
Add 6 more. That is 46.
Take away 1 pile and 2 more.
How many are left?
Draw tens and ones to show 58. Cross out 23.
Word Spot: sit, sleep
Here are new sight words.
Look at each word. Say it. Spell it.
Sit: S-I-T.
Sleep: S-L-E-E-P.
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.
Please ___ on the rug.
I ___ in my bed at night.
Great subtracting! Tomorrow we break a ten.