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Mystery Multiplication

Posted on : 09-12-2009 | By : InteractiveEducator | In : Basic Facts

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The websites: 

Classroom Applications:

Whole Class Activities:  Add variety and a new challenge to basic multiplication facts practice by asking your students to find missing factors in multiplication problems.  Use the first three websites to demonstrate finding missing factors and for whole class practice with the skill.

TurnMultiplication Trianges the second website into a whole class game by dividing your students into groups and having the groups compete to be the first to write the two missing factors on a wipe off marker board and hold the board up for everyone to view.  Or, have one member of each group race to the front of the class to write the two missing factors on the classroom whiteboard.

Turn the third website into a whole class game by dividing your students into groups and having the groups compete to be the first to shout out the missing factor.

Individual Practice:  Use these websites as a springboard for an independent assignment by asking students to apply what they know about the relationship between multiplication facts to create their own multiplication triangles.

Extension:  Place your students in groups of three.  Give each group a deck of cards with the kings, queens and jacks removed.  All cards equal their number values with aces equaling one and jokers equaling zero.   Have two students sit facing each other with the third sitting to the side of both. (The students’ positioning should create a triangle.) 

Place the deck of cards face down between the two students who are facing each other. 

Have the two students each draw a card from the top of the deck and, without looking at the cards, place them face up on their foreheads.  At this point, the students who drew cards should be able to see the card on their partner’s forehead but not their own card.  The third student who did not draw a card should be able to see both partners’ cards.  

Ask the third student to say aloud the product that results when the numbers on the cards of both students are multiplied.

The two students must then figure out what card is on their forehead (the missing factor) from looking at their partner’s card and from hearing the product. 

The first of the two students to guess their card wins a point.

Students can alternate drawing cards and calling out products, or a complete game can be played to an established point threshold before switching roles.

Enrichment:  For students who have mastered their multiplication facts, challenge them to think about the relationship between facts by completing the fourth website.  Then, ask those students to create their own ring of circles with missing factors and an answer key.  Instead of correcting their work, have them trade with a partner and complete each others’ circles for a peer evaluation.

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