Astronauts are really important people. They travel back and forth from Earth to space and other planets to study life there. They are really smart, and they often have to do a lot of mathematical calculations. If your child wishes to be an astronaut like the ones in this worksheet, they must work on their mathematical skills. Sally is on a trip through space. Ask your kids to help her visit the planets by completing each number sentence given in the picture. Check the correct answer for each one.