Math Drills
Adding and Subtracting Tens Review
B-1Fill in the Blank
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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 · Fill in the Blank12 questions
- Subtraction · Fill in the Blank12 questions
Questions & answers
Problems and answers on this worksheet
These are the problems in “Adding and Subtracting Tens”, shown with their answers.
(1)□+10=50
Answer: 40
(2)□-20=60
Answer: 80
(3)50+□=90
Answer: 40
(4)□-20=50
Answer: 70
(5)30+□=100
Answer: 70
(6)□-60=20
Answer: 80
(7)□-30=40
Answer: 70
(8)□-10=40
Answer: 50
(9)60-□=20
Answer: 40
(10)□+30=70
Answer: 40
(11)□+50=90
Answer: 40
(12)90-□=10
Answer: 80
(13)□-10=30
Answer: 40
(14)□+10=30
Answer: 20
(15)40+□=60
Answer: 20
(16)90-□=50
Answer: 40
(17)□+20=100
Answer: 80
(18)□+30=80
Answer: 50
(19)□+20=60
Answer: 40
(20)□-50=20
Answer: 70
(21)□-30=30
Answer: 60
(22)40+□=70
Answer: 30
(23)70-□=20
Answer: 50
(24)□+80=100
Answer: 20
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 Word Problems
