Lesson 3

Cubes and Place Value

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
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Use DPP item J to practice related subtraction facts for the addition facts in Group F. Have connecting cubes readily available.

  1. 7 cupcakes left; Possible response: 17 − 10 = 7; Possible strategy: I thought about two ten frames. 17 minus 10 is like taking one ten frame away. All that is left is the ten frame with seven.
  2. 9 cupcakes; Possible response: 7 + 10 = 17, 17 − 8 = 9; Possible strategy: I first added the remaining cupcakes to the new ones for a total of 17 cupcakes. I know 17 − 7 = 10 so 17 − 8 = 9 because I need to subtract one more.

J. Counting Cupcakes

Show or tell how to solve each problem.

  1. Annie and her mom make 17 cupcakes. Her brother Bert and his friends eat 10 on Tuesday. How many are left for Wednesday?

    Number sentence _________________________

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  2. On Thursday, Annie makes 10 more cupcakes. She serves them with the leftovers from Wednesday. She and her friends eat 8 cupcakes. How many are left for Bert?

    Number sentence _________________________

    image