Lesson 1

Working with Groups

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
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Use DPP item A to practice the subtraction facts in Group D. Students will need the Triangle Flash Cards: Group D, an envelope with a paper clip, and their Subtraction Facts I Know chart from Unit 9. After students sort the cards, they should clip and store the facts they know quickly and continue to practice the facts they do not know. Students can take the subtraction cards for
Group D home to practice with their families.

Ongoing Assessment

Use DPP item A to assess students’ fluency with the subtraction facts related to the addition facts in Group D [E9].

See the Letter Home for targeted practice ideas.

A. Triangle Flash Cards: Group D Subtraction Facts

With a partner, use your Triangle Flash Cards to practice subtraction facts. One partner covers the corner with a number in the circle. This number is the answer to a subtraction fact. Use the other two numbers to solve a subtraction fact. Sort the flash cards into three piles: Facts I Know Quickly, Facts I Can Figure Out, and Facts I Need to Learn. Circle the facts you know quickly on your Subtraction Facts I Know chart.

Put the cards back into one pile and go through them again. This time, your partner covers the number in the square. This number will now be the answer. Use the other two numbers to solve a subtraction fact.

Sort the cards into three piles again. Circle the facts you know quickly on your Subtraction Facts I Know chart. Clip cards from the Facts I Know Quickly pile together and place them into an envelope. Take the chart and flash cards home to practice.

Repeat the directions for your partner.