Math Drills
Addition and Subtraction up to 20 Review
A-2Calculation
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What this worksheet covers
Using the idea of ten and some more, this unit covers addition and subtraction up to 20 with no carrying and no borrowing, such as 13 + 4 and 17 - 5. The group of ten stays as it is and only the ones digits are worked on, and Fill in the Blank and Word Problems confirm the same idea.
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Writing 13 + 4 as 7 is the telling error: only the ones are added and the group of ten is dropped. A single-digit answer points to this pattern. Answering 7 for 17 - 5, by subtracting from the 1 in the tens place as well, follows close behind.
The reasoning itself does not change; only the range of numbers grows beyond Addition up to 10 and Subtraction up to 10. Extending the range while leaving the underlying way of seeing numbers untouched is the same path taken again in Adding and Subtracting Tens.
- Sums up to 20 · Calculation12 questions
- Subtraction up to 20 · Calculation12 questions
Questions & answers
Problems and answers on this worksheet
These are the problems in “Addition and Subtraction up to 20”, shown with their answers.
(1)10+2=□
Answer: 12
(2)15+1=□
Answer: 16
(3)12+4=□
Answer: 16
(4)19+1=□
Answer: 20
(5)10+5=□
Answer: 15
(6)10+9=□
Answer: 19
(7)16+2=□
Answer: 18
(8)13+2=□
Answer: 15
(9)11+2=□
Answer: 13
(10)10+7=□
Answer: 17
(11)14+1=□
Answer: 15
(12)11+3=□
Answer: 14
(13)13-2=□
Answer: 11
(14)16-1=□
Answer: 15
(15)20-6=□
Answer: 14
(16)17-5=□
Answer: 12
(17)13-1=□
Answer: 12
(18)19-1=□
Answer: 18
(19)19-7=□
Answer: 12
(20)18-8=□
Answer: 10
(21)20-3=□
Answer: 17
(22)18-1=□
Answer: 17
(23)19-9=□
Answer: 10
(24)19-3=□
Answer: 16
What to do next
More worksheets in this unit
Sums up to 20Sums up to 20 Fill in the Blank
Sums up to 20Sums up to 20 Word Problems
Subtraction up to 20Subtraction up to 20 Calculation
Subtraction up to 20Subtraction up to 20 Fill in the Blank
Subtraction up to 20Subtraction up to 20 Word Problems
Addition and Subtraction up to 20 ReviewAddition and Subtraction up to 20 Review Fill in the Blank
Addition and Subtraction up to 20 ReviewAddition and Subtraction up to 20 Review Word Problems
