# Operations & Algebraic Thinking

## Window Sum

Directions: Using the digits 0-9, no more than once, complete the puzzle so that the sum of each side is equivalent. Source: Joshua Nelson and Renee Owen

## Domino Window

Directions: Use four of these dominoes to form a square with the same number of dots on each side. Source: Joshua Nelson

## Domino Window 1

Directions: Use four of these dominoes to form a square with the same number of dots on each side. Source: Joshua Nelson

## Make it Equal

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to create a true statement. Source: Molly Rawding

## Equality 2

Directions: Using the digits 1 to 9, at most one time each, fill in the boxes to create a true number sentence with the greatest possible value. Source: Robert Kaplinsky

## Equality

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to create two true number sentences. You may reuse all the digits for each number sentence. Source: Robert Kaplinsky

## 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. …

## Equality

Directions: Using the digits 0-9 at most one time each, fill in the boxes below to make a true statement. Source: Graham Fletcher