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Count objects without losing track by matching one number word to each object, then use skip-counting to count equal groups faster.
Decide which whole-number amount is greater, less, or equal by matching items, reading comparison symbols, and ordering written numbers.
Apply the previous explanations in a guided problem.
Use addition for putting together or increasing, and subtraction for taking away, comparing, or finding a missing amount. Practice checking each operation with its inverse.
Model multiplication as equal groups, arrays, and repeated addition. Use factors, products, and the commutative property to build fluency with facts.
Check your understanding with a short quiz.
Use division to split a total into equal shares or equal groups, then connect quotients and remainders back to multiplication.
Make whole-number calculations easier by using identity, commutative, associative, and distributive properties to rearrange or break apart numbers.
Evaluate whole-number expressions with parentheses and the standard order of operations so that the same expression gives one agreed answer.
Turn word problems into whole-number calculations by identifying what is known, what is being asked, and which operation or operations fit the situation.
Review this chapter with practice based on your mistakes.
