Unit 3 - Lesson 19 - Grade 3: Illustrative Mathematics

What do you notice?

What do you wonder?

Situation 1: Mai had 104 beads. She bought two packs of beads and now she has 124 beads. How many beads were in each pack?

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Explain your reasoning.

Situation 2: Mai had some beads. She bought 2 more packs of beads and each pack has 10 beads in it. Now she has 124 beads. How many beads did Mai have before?

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Explain your reasoning.

Situation 3: Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it. How many beads does she have now?

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Explain your reasoning.

104 + 2 x 10 = n

• Situation 1: Mai had 104 beads. She bought two packs of beads and now she has 124 beads.
• Situation 2: Mai had some beads. She bought 2 more packs of beads and each pack has 10 beads in it.Now she has 124 beads.
• Situation 3: Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it.

104 + (2 x n) = 124

• Situation 1: Mai had 104 beads. She bought two packs of beads and now she has 124 beads.
• Situation 2: Mai had some beads. She bought 2 more packs of beads and each pack has 10 beads in it.Now she has 124 beads.
• Situation 3: Mai had 104 beads. She bought 2 more packs of beads and each pack has 10 beads in it.