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Number Grid Puzzles: Addition and Subtraction with Missing Values ... - Free Printable

Educational worksheet: Number Grid Puzzles: Addition and Subtraction with Missing Values .... Download and print for classroom or home learning activities.

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Show Answer Key & Explanations Step-by-step solution for: Number Grid Puzzles: Addition and Subtraction with Missing Values ...

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- The Star of David is composed of two overlapping triangles.
- The top triangle has vertices with numbers 13, 16, and the missing number (let’s call it X).
- The bottom triangle has vertices with numbers 34, 20, and 28.
- A common pattern in such puzzles is that the sum of the numbers at the vertices of each large triangle is equal.
- Sum of the bottom triangle: 34 + 20 + 28 = 82.
- Therefore, the sum of the top triangle must also be 82: 13 + 16 + X = 82.
- Solve for X: 29 + X = 82 → X = 82 - 29 = 53.

The missing number is 53.

Parent Tip: Review the logic above to help your child master the concept of missing number puzzles.

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