30 Addition and Subtraction Concepts
Rigorous Problem Solving with the Concept
of Counting On and Counting Back 1
In the game Nifty Fifty players can add or subtract the
numbers rolled. At the end of the game, the player who
scores 50 or is the closest to 50 is the winner.
David had a score of 48. In his last 3 turns, he rolled 4, 5, 3.
Kolby had a score of 52. In his last 3 turns, he rolled 2, 4, 1.Part A
Which of the following describe how the game ended?o David won with a score of 51.
o David lost with a score of 53.
o David won with a score of 50.
o Kolby won with a score of 50.
o Kolby lost with a score 49.
o Kolby won with a score of 49.
o Kolby won with a score of 52.
o David and Kolby both scored 49.Part B
Use words or equations to explain how you know your
answer is correct.© 2016, Math Intervention: Grades 3–5, Jennifer Taylor-Cox, Routledge