106 Addition and Subtraction Concepts
Rigorous Problem Solving with the Concept of
Equal Differences 1
Kayla announced that 93 – 58 = 95 – 60. Do you agree or
disagree?Part A
Is Kayla correct or incorrect? Use the number
line to prove you answer.Part B
If 62 pennies were tossed in air and 39 of them landed on
heads, how many landed on tails?
Use a place value strategy to prove your answer.Part C
If 73 pennies were tossed in air and 41 of them landed on
heads, how many landed on tails?
Use a place value strategy to prove your answer.© 2016, Math Intervention: Grades 3–5, Jennifer Taylor-Cox, Routledge
50 51 52 53 54^55 56 57 58 59 60 61 62 63 64^65 66 67 68 69 70 71 72 73 74^75 76 77 78 79 80 81 82 83 84^85 86 87 88 89 90 91 92 93 94^95 96 97 98 99 100