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Module 2.5 Extending the Count-On Addition Strategy to Two-Digit Numbers.

Published byTheodore Briggs Modified over 9 years ago

Presentation on theme: "Module 2.5 Extending the Count-On Addition Strategy to Two-Digit Numbers."— Presentation transcript:

1 Module 2.5 Extending the Count-On Addition Strategy to Two-Digit Numbers

2 Start at 24 and count by 2s. Start at 48 and count by 2s Start at 33 and count by 2s Start at 51 and count by 2s Start at 20 and count by 20s Extending the Count-On Addition Strategy to Two-Digit Numbers

3 What helped you figure out the sequence? How is counting by 20s the same as counting by twos? How is it different? Counting by 20s is the same as counting by twos except that tens are used instead of ones. Start at 10 and count by 20s. Extending the Count-On Addition Strategy to Two-Digit Numbers

4 What helped you figure out the sequence? How is counting by 20s the same as counting by twos? How is it different? Counting by 20s is the same as counting by twos except that tens are used instead of ones. Start at 10 and count by 20s. Extending the Count-On Addition Strategy to Two-Digit Numbers

5 What is the total? What can help you figure out the total? Skip count Add the tens places together Extending the Count-On Addition Strategy to Two-Digit Numbers

6 What is the total? What can help you figure out the total? Skip count Add the tens places together Extending the Count-On Addition Strategy to Two-Digit Numbers

7 What is the total? What can help you figure out the total? Skip count Add the tens places together Extending the Count-On Addition Strategy to Two-Digit Numbers

8 What is the total? What do you know about adding tens that could help you figure out the total? Counting by 10s from 43 Add the tens places together first then add the ones Use a hundreds chart Extending the Count-On Addition Strategy to Two-Digit Numbers

9 What is the total? What do you know about adding tens that could help you figure out the total? Counting by 10s from 43 Add the tens places together first then add the ones Use a hundreds chart Extending the Count-On Addition Strategy to Two-Digit Numbers

10 What is the total? What do you know about adding tens that could help you figure out the total? Counting by 10s from 43 Add the tens places together first then add the ones Use a hundreds chart Extending the Count-On Addition Strategy to Two-Digit Numbers

11 What is the total? What do you know about adding tens that could help you figure out the total? Counting by 10s from 43 Add the tens places together first then add the ones Use a hundreds chart Extending the Count-On Addition Strategy to Two-Digit Numbers