Directions: Using the digits 1 to 9 at most one time each, place a digit in each box to make the smallest possible decimal sum. Source: Kari Frazier

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

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

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create two different decimals that are equivalent when rounded to the nearest tenth and have the least possible value. Source: Robert Kaplinsky

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create two different decimals that are equivalent when rounded to the nearest tenth. Source: Robert Kaplinsky

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create two different decimals: one that is greater than 5 and one that is less than 5. Source: Robert Kaplinsky

Directions: Using the digits 0 to 9 at most one time each, place a digit in each box to create two decimals that are close to 5 as possible but also equally far away from 5. Source: Robert Kaplinsky

Directions: Using the digits 1-9, at most once each, fill in the boxes to make a true statement. Source: Adina Rochkind

Directions: Directions: Using the digits 0 to 9, at most one time each, fill in the boxes to create numbers on the number line. Source: Anne Oliveira

Directions: Using the digits 1-9, subtract two numbers to get a difference closest to 0.     Source: Owen Kaplinsky