Math Drills
Addition and Subtraction up to 20 Review
C-3Word Problems
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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 · Word Problems3 questions
- Subtraction up to 20 · Word Problems3 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)At the store, Ethan bought 10 loaves of bread. If his little sister Lily buys 1, how many will there be altogether? Answer □
Answer: 11loaves
(2)At home, Taylor has 15 oranges. If her big sister gives her 4 more, how many will there be in all? Answer □
Answer: 19oranges
(3)In the henhouse, there are 13 chicks. If 2 more come from the eggs, how many will there be in all? Answer □
Answer: 15chicks
(4)There are 12 chicks in the chicken coop. If 1 flies away, how many are left? Answer □
Answer: 11chicks
(5)Mom bought 18 carrots. If she uses 6, how many are left? Answer □
Answer: 12carrots
(6)At the festival, there were 16 balloons. If 3 fly away into the sky, how many are left? Answer □
Answer: 13balloons
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 Calculation
Addition and Subtraction up to 20 ReviewAddition and Subtraction up to 20 Review Fill in the Blank
