Lesson 8.28.2 Small Group · Group 1
Group 1 · Set BSecond form · new problems, same idea
Learning target With my small group, I can solve one-step addition and subtraction equations using inverse operations — one step at a time, with support.
Remember8.2 Small Group · Group 1
Subtraction undoes addition, and addition undoes subtraction, so do the inverse operation to both sides to get the variable alone. To solve an equation, use the inverse operation on both sides to get the variable alone.
Words: Equation (Ecuación)Inverse operation (Operación inversa)Isolate (Despejar)Solution (Solución)One-step equation (Ecuación de un paso)
-
1Complete each step, then write the final answer.
Solve n + 15 = 40.
Show your workHint 15 is added to n. Subtract 15 from both sides.
Final answer: -
2Complete each step, then write the final answer.
Solve y + 35 = 62.
Show your workHint 35 is added to y. Subtract 35 from both sides.
Final answer: -
3Complete each step, then write the final answer.
Some players were at the park. Then 13 players went home. Now 25 players are at the park. How many players were there at first?
Show your workHint Let p be the players at first. 13 went home, so write p − 13 = 25.
Final answer: -
4Complete each step, then write the final answer.
Solve 64 = n + 19. The variable is on the right side this time.
Show your workHint 19 is still added to n. Subtract 19 from both sides.
Final answer:
Explain your thinkingKai subtracted when he should have added. How do you know which inverse operation to use?
Sentence starter The equation ___ the number, so I ___ to undo it. · I check my answer by ___.