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Adding and subtracting

Four ways through adding and taking away, from facts within 20 to tens and ones and stories to work out.

Explain the relationship between addition and subtraction and apply the properties of operations to solve real-life addition and subtraction problems within 20.

Level
4 exercises
1 Making a ten to addGrade 1 Easy Getting to ten first, then adding what is left.10 questions 2 Addition within 20Grade 1 Medium Adding and taking away within 20, and how the two undo each other.10 questions 3 Adding within 100Grade 1 Medium Adding and taking away tens and ones, and what the equals sign really means.10 questions 4 Story problemsGrade 1 Hard Deciding whether a story is asking you to add or to take away.10 questions