Decimal Multiplication: Reducing the Weight

Eight questions challenge mathematicians to multiply decimals. A color-coded tool with movable parts assist participants in answering word problems. Item response types include fill in the blank, multiple-choice, and a discussion.   

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CCSS: Adaptable
Instructional Ideas

  • Assign the interactive for extra practice after in-class instruction on multiplying decimals 
  • Work with a small group during math center rotations in completing the interactive—guide members through the practice, encourage them to use their notes
  • Send the link home for optional practice outside of school 
Classroom Considerations

  • Create a free CK-12 account to access the interactive 
  • In case devices are not readily available in your classroom, coordinate time in the computer lab or reserve a technology cart 


  • The tool is straightforward, generally easy for users to move but do remind them to go slowly as numbers can be missed  
  • Correct answers are revealed if responses are incorrect 

  • The tool's numbers do not go as high as what is asked in the problems 
Common Core