Page 53 - TG_G1_CH6_CHRIS

STEP BY STEP
TIME TO LEARN

This exercise requires children to use base-ten blocks to subtract. Tens Ones You already
Introduce exercise 1 to children. − 5 2 0 0 know 5 – 2 = 3.
3 0
Ask: How many is 7 - 1? 6 ones 50 − 20 = 30
How many is 7 tens - 1 ten? 6 tens
How many is 70 - 10? 60 subtract
STEP Subtract. tens
BY
STEP
Another example:
After solving the Step-By-Step practice, write 30 – 10 = ___ on the board. Have 1 3 30 − 30 = 0
children model base ten rods to take away using crossing out. 70 − 10 = 60
This extra example allows children to recognize math in everyday life and use
models to solve problems.
2 90 − 50 = 40 4 4 tens − 2 tens = 20

5 Tens Ones 6 Tens Ones 7 Tens Ones
MULTIPLE INTELLIGENCE ACTIVITY − 4 1 0 0 − 9 4 0 0 − 7 6 0 0
3 0 5 0 1 0
Use the Multiple Intelligence Activity for this lesson to enrich and 299
engage the different learning styles of each child.

PR A C TI C E

P R A C T I C E P R A C T I C E
Ask children to complete the practice exercises independently. Walk around A. Match.
the class and monitor children progress. 50 − 10 90 − 20 80 − 30

Exercise A and B assesses subtracting tens. Children are free to use different
strategies. 50 70 40
B. Subtract.
Exercise C assesses translating words into number sentences.
1 40 − 20 = 20 5 70 − 30 = 40 9 90 − 10 = 80
2 50 − 40 = 10 6 60 − 30 = 30 10 80 − 50 = 30
I got it 50%
3 90 7 60 11 40
If child needs help solving exercises, assist with the use of − 30 − 10 − 10
manipulatives. Assign it to Reteach Practice Book for additional 60 50 30
support. 4 − 80 8 − 50 12 − 30
40
20
20
I got it 75% 40 30 10
C. Subtract. Write the number.
If child correctly solves the exercises independently using 1 60 take away 30 is . 70 less than 90 is .
30
20
manipulatives, assign the Practice Book for independent 3
10
70
study. Help children solve the exercises independently using 2 50 subtract 40 is . 4 80 subtract 10 is .
manipulatives 300
I got it 100%
If child solves the exercises independently without the use of
manipulatives, assign the Enriched Practice Book for advanced
independent study.

444