A set of 10 fun brainteasers for your students in lower grades.

Give your students one brainteaser a day or a week to try and solve. You could have a ‘solutions box’ at the front of the classroom. Each time your students are ready to submit their answer, they can write their name and answer on a piece of paper and drop it into the box. At the end of the day or week you would reveal the answer.

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol...

Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 ...

Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with...

Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends.

Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in addin...

Use a problem-solving model that incorporates
analyzing given information, formulating a plan or strategy, determining a solution,
justifying the solution, and evaluating the problem-solving process and the reasonableness of the solution;

Communicate mathematical ideas, reasoning, and their implications using
multiple representations, including
symbols, diagrams, graphs, and language as appropriate;

Use objects and pictorial models to solve
word problems involving joining, separating, and comparing sets within 20
and unknowns as any one of the terms in the problem such as 2 + 4 = [ ]; 3 + [ ] = 7; and 5 = [ ] - 3;

Use a problem-solving model that incorporates
analyzing given information, formulating a plan or strategy, determining a solution,
justifying the solution, and evaluating the problem-solving process and the reasonableness of the solution;

Communicate mathematical ideas, reasoning, and their implications using
multiple representations, including
symbols, diagrams, graphs, and language as appropriate;

Solve one-step
and multi-step
word problems involving addition
and subtraction within 1,000 using a variety of strategies
based on place value, including algorithms; and

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