## Close to 1000

Directions: Using the digits 1 to 9 at exactly one time each, fill in the boxes to make the sum as close to 1000 as possible. Source: John Ulbright and Robert Kaplinsky

## Sums to 100

Directions: Using the digits 1 to 9 at most one time each, fill in the boxes to create the closest possible sum to 100. Source: Graham Fletcher

## Subtraction without Regrouping

Directions: Fill in the boxes so that you would not need to regroup when you subtract. Make sure your number is less than 63. Extension: Explain why you do NOT need to regroup using your number. Source: Chase Orton

## Parts Unknown Problems

Directions: Complete the story problem and answer statement. Version 1 (Difficult) Lucy has _____ apples. She has nine _____ (more/less) than Marcus. How many apples does _____ (Lucy/Marcus) have? _____ (Lucy/Marcus) has _____ apples. Version 2 (Medium Difficulty) Lucy has _____ apples. She has nine less than Marcus. How many apples does _____ (Lucy/Marcus) have? _____ (Lucy/Marcus) has _____ apples. …

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

## Subtracting Two-Digit Numbers (Elementary)

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

## Drawing and Naming Shapes by Angles

Directions: Draw and name a shape that has the following characteristics: Has 3 angles Has 4 angles Has 5 angles Has 6 angles Has two equal sides Has five equal sides Source: Bryan Anderson

## Constructing Rectangles

Directions: Using the following squares, how many different rectangles can you make? Source: Bryan Anderson