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Math Drills

Adding and Subtracting Tens Review

C-2

Word Problems

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What this worksheet covers

Problems such as 30 + 20 and 50 - 20 are handled by counting how many groups of ten there are. Three tens and two tens make five tens, and recounting this way produces the answer, an idea practiced through Calculation, Fill in the Blank and Word Problems.

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The first error is answering 5 for 30 + 20, dropping the 0 in the ones place. The opposite also appears, with both zeros lined up to give 500. Whether the answer has two digits shows whether the child is still counting in groups of ten.

Treating 10 as a single unit, an idea taken from Addition and Subtraction up to 20, is stretched here to calculations between tens digits. In 2-Digit ± 1-Digit, ones and tens appear together for the first time, so working with each place separately comes up even more often.

  • Addition · Word Problems3 questions
  • Subtraction · Word Problems3 questions
Questions & answers

Problems and answers on this worksheet

These are the problems in “Adding and Subtracting Tens”, shown with their answers.

  1. (1)For snack time, Ethan brought 20 bananas and Olivia brought 40. How many are there in all? Answer □

    Answer: 60bananas

  2. (2)At home, Grace has 10 cookies baked today and 20 cookies baked yesterday. How many are there in all? Answer □

    Answer: 30cookies

  3. (3)On the mountain, 10 birds are perched in the left tree and 70 in the right tree. How many are there in all? Answer □

    Answer: 80birds

  4. (4)At the festival, there were 60 candies. You handed out 20 to the children. How many are left? Answer □

    Answer: 40candies

  5. (5)At snack time, there were 90 cookies. The whole class ate 40. How many are left? Answer □

    Answer: 50cookies

  6. (6)At the greengrocer's, 50 apples are lined up. Today 20 were sold. How many are left? Answer □

    Answer: 30apples

What to do next

Adding TensAdding Tens Calculation
More worksheets in this unit
Adding TensAdding Tens Fill in the BlankAdding TensAdding Tens Word ProblemsSubtracting TensSubtracting Tens CalculationSubtracting TensSubtracting Tens Fill in the BlankSubtracting TensSubtracting Tens Word ProblemsAdding and Subtracting Tens ReviewAdding and Subtracting Tens Review CalculationAdding and Subtracting Tens ReviewAdding and Subtracting Tens Review Fill in the Blank
Next unit: 2-Digit ± 1-Digit
Other versions of this worksheet

Other versions of this worksheet