Numbers before and after, neighboring tens
Every number has a neighbor that is one less and one more, and it always sits between two full tens: 56 comes after 55 and before 57, and 47 lies between 40 and 50. This prepares second graders for rounding and mental math.
How to solve this
- The neighbours of a number are the number that comes just before it (minus 1) and the one just after it (plus 1).
- For any number n, the left neighbour is n − 1 and the right neighbour is n + 1.
- Check by counting on the number line: the neighbours should be the two numbers directly touching yours.
Examples
__, 56, __
55, 57
Neighbour tens of 47
40, 50
Practice problems with answers
Solve these problems on paper or out loud, then check the answer key. The online practice and the printable worksheet give a new set every time.
- Neighbour tens of 72: ___ and ___
- ___ , 43 , ___
- ___ , 39 , ___
- ___ , 15 , ___
- Neighbour tens of 23: ___ and ___
- ___ , 93 , ___
- Neighbour tens of 98: ___ and ___
- ___ , 61 , ___
Show answers
- 70 and 80
- 42 and 44
- 38 and 40
- 14 and 16
- 20 and 30
- 92 and 94
- 90 and 100
- 60 and 62