Question

When asked to compute 423 - 157, Pat (a third-grader) wrote the following: 4- 30- 34- 300 266 "You can't take 7 from 3; it's 4 too many, so that's negative 4. You can't take 50 from 20; it's 30 too many, so that's negative 30; and with the other 4, it's negative 34. 400 minus 100 is 300, and then you take the 34 away from the 300, so it's 266." For full credit for this discussion you must discuss the following in your post. You must also respond and evaluate at least 2 other classmate's posts. 1. Pat's idea for calculating 423-157. Is her method legitimate? 2. Analyze and show Pat's method in terms of expanded forms. Expanded form can be found on page 6 in our textbook. Could you use Pat's idea to calculate 317 - 289? If so, write what you think Pat might write, and also use expanded forms. You must make a post before you can read and reply to other threads.

          When asked to compute 423 - 157, Pat (a third-grader) wrote the following:
4-
30-
34-
300
266
"You can't take 7 from 3; it's 4 too many, so that's negative 4. You can't take 50 from 20; it's 30 too many, so that's negative 30; and with the other 4, it's negative 34. 400 minus 100 is 300, and then you take the 34 away from the 300, so it's 266."

For full credit for this discussion you must discuss the following in your post. You must also respond and evaluate at least 2 other classmate's posts.

1. Pat's idea for calculating 423-157. Is her method legitimate?
2. Analyze and show Pat's method in terms of expanded forms. Expanded form can be found on page 6 in our textbook.

Could you use Pat's idea to calculate 317 - 289? If so, write what you think Pat might write, and also use expanded forms. You must make a post before you can read and reply to other threads.

When asked to compute 423 - 157, Pat (a third-grader) wrote the following:
4-
30-
34-
300
266
"You can't take 7 from 3; it's 4 too many, so that's negative 4. You can't take 50 from 20; it's 30 too many, so that's negative 30; and with the other 4, it's negative 34. 400 minus 100 is 300, and then you take the 34 away from the 300, so it's 266."

For full credit for this discussion you must discuss the following in your post. You must also respond and evaluate at least 2 other classmate's posts.

1. Pat's idea for calculating 423-157. Is her method legitimate?
2. Analyze and show Pat's method in terms of expanded forms. Expanded form can be found on page 6 in our textbook.

Could you use Pat's idea to calculate 317 - 289? If so, write what you think Pat might write, and also use expanded forms. You must make a post before you can read and reply to other threads.

Added by Dolores C.

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