This worksheet practices the skill of comparative relational thinking by asking students to determine whether 10 subtraction equations are true or false without calculating. For example, you know that 17 - 13 = 20 - 16 because 20 is 3 more than 17 and 16 is 3 more than 13. Adding three to both numbers in the subtraction expression on the left side of the equation results in a subtraction expression of the same value. Students are asked to prove their answer by providing this information. Answer key included. Created by Amber Mealey.
This worksheet can be used to assess Fourth Grade Mathematics Florida Standard MAFS.4.OA.1.a: Determine whether an equation is true or false by using comparative relational thinking. For example, without adding 60 and 24, determine whether the equation 60 + 24 = 57 + 27 is true or false.