Adding and subtracting large numbers can sometimes be difficult. Estimating is an easy way to figure out if your answer is close, or if you need to try again.

Find out what fills a room, but takes up no space, with this riddle and math combo worksheet. Use subtraction skills to solve the riddle on this math worksheet.

Subtracting with multiple zeros in the “top number” doesn’t need to be a seemingly endless cycle of borrowing. The Subtract One strategy simplifies the task with two easy steps.