Test
Addition and subtraction within 20
Dynamic addition, subtraction, missing-number and short word-problem tasks within 20.
Time left: 00:00:00
Sample questions
- Calculate: ___ + ___.
- Calculate: ___ − ___.
- Which number fits? ___ + __ = ___.
- Which number fits? ___ − __ = ___.
- ___ pages were read, then ___ more. How many pages were read in total?
Addition and subtraction within 20
When calculating within 20, it helps to split a number into ten and ones. Count forward to add and backward to subtract, first reaching the nearest ten when useful.
Word problems
Words such as “more”, “altogether” and “in total” usually suggest addition, while “got off”, “gave away” and “left” suggest subtraction. Find a missing addend by subtracting the known addend from the sum. Check with the inverse operation and ensure the result answers the question.
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