Math Drills
Adding and Subtracting Tens Review
C-3Word 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)In the henhouse, Henry has 40 eggs in a big basket and 50 in a small basket. How many are there in all? Answer □
Answer: 90eggs
(2)At the party, Sophia has 30 chocolates in a red box and 60 in a blue box. How many are there in all? Answer □
Answer: 90chocolates
(3)At home, Liam has 10 peaches in a basket and 40 in another basket. How many are there in all? Answer □
Answer: 50peaches
(4)At the park, Liam picked up 70 leaves. 30 flew away in the wind. How many are left? Answer □
Answer: 40leaves
(5)During craft time at school, there were 40 sheets of paper. You gave 10 to the next class. How many are left? Answer □
Answer: 30sheets
(6)On the power line, 70 birds were perched. A sound startled them and 20 flew away. How many are left? Answer □
Answer: 50birds
What to do next
More worksheets in this unit
Adding TensAdding Tens Fill in the Blank
Adding TensAdding Tens Word Problems
Subtracting TensSubtracting Tens Calculation
Subtracting TensSubtracting Tens Fill in the Blank
Subtracting TensSubtracting Tens Word Problems
Adding and Subtracting Tens ReviewAdding and Subtracting Tens Review Calculation
Adding and Subtracting Tens ReviewAdding and Subtracting Tens Review Fill in the Blank
