Do you add or subtract? It's up to your mathematicians as they fill in the symbol for 16 equations to make them true. The numbers in this section don't exceed 18. Next, learners answer six word problems by determining the missing addend or minuend from each written-out equation (i.e. "I add 3 to a number and get 23. What was my original number?"). Finally, there are 16 more missing-symbol problems, this time with larger numbers. Digits in this section don't exceed 84.