Math Brainteasers - Lower Grades

CCSS.MATH.CONTENT.1.OA.A.1

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...

CCSS.MATH.CONTENT.1.OA.B.3

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 ...

CCSS.MATH.PRACTICE.MP1

CCSS.MATH.CONTENT.2.OA.A.1

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...

CCSS.MATH.CONTENT.2.OA.C.4

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.

CCSS.MATH.CONTENT.2.NBT.B.7

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...

CCSS.MATH.PRACTICE.MP4

CCSS.MATH.PRACTICE.MP6

Math 1.1(A)

Apply mathematics to problems arising in everyday life, society, and the workplace;

Math 1.1(B)

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;

Math 1.1(D)

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

Math 1.3(B)

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;

Math 1.3(E)

Explain strategies used to solve addition and subtraction problems up to 20 using spoken words, objects, pictorial models, and number sentences; and

Math 2.1(A)

Apply mathematics to problems arising in everyday life, society, and the workplace;

Math 2.1(B)

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;

Math 2.1(D)

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

Math 2.1(E)

Create and use representations to organize, record, and communicate mathematical ideas;

Math 2.3(B)

Explain that the more fractional parts used to make a whole, the smaller the part; and the fewer the fractional parts, the larger the part;

Math 2.4(C)

解决involv一步和多步词问题ing addition and subtraction within 1,000 using a variety of strategies based on place value, including algorithms; and

Math 2.6(A)

Model, create, and describe contextual multiplication situations in which equivalent sets of concrete objects are joined; and