Mental Math and Addition Challenges

Solve mental math chains to find a final sum, spell the number, and identify numbers before and after given values.

Calculate the missing numbers in squares where the sum of the four surrounding numbers equals the center value.

Fill in the top hexagons by adding the two numbers below, and circle different ways to make the number 15.

Solve grid puzzles by finding the numerical value of different winter-themed objects based on row and column sums.