Addition and Subtraction Concepts 69Rigorous Problem Solving with the Concept of
Adding Doubles and Near Doubles 1
Samantha and Kayla are playing X Marks the Spot. In this
game, players roll a number, double it, and mark the sum on
the game board. Samantha rolled 5, 3, and 4. Kayla rolled 6, 2,
and 5.
Part A
Which set of numbers represents Kayla’s sums?
o 12, 4, 5
o 10, 6, 8
o 12, 2, 10
o 11, 4, 10
o 12, 4, 10
o 10, 4, 8
o 12, 4, 11
Part B
James says 7 + 8 = 17 because 8 + 8 = 16 and 16 + 1 = 17
Do you agree with James?
Why or why not?
© 2016, Math Intervention: Grades 3–5, Jennifer Taylor-Cox, Routledge