# Operations & Algebraic Thinking

## Adding and Subtracting Within 10

Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make a true statement. Source: Owen Kaplinsky

## Adding One-Digit Numbers (< 5) 2

Directions: Using the digits 1 to 5, at most one time each, fill in the boxes to create a true number sentences with the greatest possible sum. Source: Robert Kaplinsky

## Adding One-Digit Numbers (< 5)

Directions: Using the digits 1 to 5, at most one time each per number sentence, fill in the boxes to create two or more true number sentences. Source: Robert Kaplinsky

## Domino Friends of Ten

Directions: I picked 3 dominoes out of a bag and they all had exactly 10 pips, but the same number was not on both sides of any of the dominoes. Which dominoes could I have picked? Is there more than one answer? Source: Brian Kelley

## Sum of 5

Directions: I rolled 2 dice and when I counted the pips (dots), there were 5 altogether. What could I have rolled on the dice? I rolled again and got 5 again, but I didn’t get the same numbers as before. What could my new roll be? Source: Brian Kelley

## Decomposing Numbers Less Than Or Equal to 10

Directions: Add spots to each dog to make the total number of spots equal 10. Source: Unknown