Addition and Subtraction Crossword Puzzle

QUESTIONS LIST: word form : a way of using words to write a number, expanded form : a way to write numbers that shows the place value of each digit, difference : the amount remaining after one quantity is subtracted from another, equation : a mathematical sentence with an equal sign. the amount on one side of the equal sign has the same value as the amount on the other side, sum : the answer to an addition sentence, standard form : he common or usual way of writing a number, addend : any number being added, digit : any of the following symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, decompose : to separate into it's place value, unknown : the missing answer that you are trying to figure out