Operations & Algebraic Thinking
Problem 153: Number Sentence Puzzles - Students are presented with three number sentences such as 145 + N = 375, and asked to select which 'spacy' word problem they belong to. [Grade: 3-4 | Topics: Number Topics and problem solving]
Problem 149: Equations with One Variable - Students solve formulas of the form 2001 = 1858 + 11x to find 'X'. [Grade: 3-5 | Topics: addition, subtraction, multiplication, division; solving simple equations]
Problem 24: Reading Between the Lines Students solve simple equations for x, (like 2x + 3 = 5) to discover which words complete an essay on the causes of aurora, and answer questions after reading the completed essay. [Grade: 5 - 7 | Topics: solving for X; distributive law; associative law]
