Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) difference. Source: Robert Kaplinsky

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## Adding Fractions

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the smallest (or largest) sum. Source: Robert Kaplinsky

Read More »## Adding Mixed Numbers

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to make the largest sum. Source: Robert Kaplinsky

Read More »## Subtracting Mixed Numbers

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make the least possible difference. Source: Robert Kaplinsky

Read More »## Which Circle Is Bigger? (Middle School)

Directions: Which circle is bigger: one with an area of 30 square units or one with a circumference of 30 units? How do you know? Source: Robert Kaplinsky

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