How many apples is less than five? Each of these problems has two images, one with quantifiable details and one without (i.e. a tree with apples and an empty tree). Answers will vary as young counters draw objects onto the second image...

Mental mathematicians add and subtract 1, 10, and 100 from sets of numbers. Each set of one, two and three-digit numbers gives scholars a chance to practice their addition and subtraction skills. There are 62 whole numbers in all. What...