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Category: Number and Operations

Equivalent Fractions on the Multiplication Matrix

Equivalent Fractions on the Multiplication Matrix

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I’d been staring at equivalent fractions for eons and never knew it. Check out this multiplication matrix filled with them! Way cool! Starting simply, look at the first two rows in the upper left.  The number in the first row (numberator) is ‘1’ and the number in the second row (denominator) is ‘2’.  Those numbers represent the fraction 1/2.  All the numbers in the two rows to the right reflect the equivalent fractions. This works for any two numbers picked…

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Jeopardy in the Elementary Math Classroom

Jeopardy in the Elementary Math Classroom

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Just finished a unit and want your students to review what they learned? Getting ready for the chapter test? Just want to have fun? Jeopardy is a great way to review and reinforce what students have been learning. This photo shows some of the categories I use in the primary grades. The ones at the bottom show additional categories. Pretty much anything you’ve been learning can work. The students in my classroom are already set up in groups of 4-5….

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Number Theory: Square Numbers

Number Theory: Square Numbers

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Making rectangular arrays with tiles is a great visual way to have students understand multiplication as repeated addition. And since we’re making arrays anyway, why not tie in square numbers. A square number is: 1) A number that can be expressed as the product of the same two numbers. 2) The product of a number multiplied by itself. When making rectangluar arrays, square nuumbers (1, 4, 9, 16…) always make a square. Besides, there are some very neat patterns that…

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Multiplication Arrays Around Us…and Division, Too

Multiplication Arrays Around Us…and Division, Too

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If you look close enough you’ll find yourself surrounded by multiplication arrays. An array is made up of horizontal rows and vertical columns. It’s a great, visual way to show multiplication as repeated addition or divisions as equal shares. For example, the top array shows two rows and three columns. The equations that represent this array are: 3 + 3; 3 x 2; 6/3. In a multiplication equation, we always say rows first, then columns. If you want to tie…

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