Doubling
Doubling means adding a number to itself: double 18 is 18 + 18 = 36. A quick way is to double the tens and the ones separately (20 + 16). Doubles are also a stepping stone to the 2, 4 and 8 times tables.
How to solve this
- Doubling a number means adding it to itself: double 7 is 7 + 7 = 14.
- For two-digit numbers, double the tens and the ones separately, then combine: double 34 = (2×30) + (2×4) = 60 + 8 = 68.
- Check by halving your answer — you must get back the original number.
Examples
Double 18
36
24 + 24 = ?
48
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.
- Double of ___ is 52
- Double of ___ is 10
- Double 18 = ___
- Double 23 = ___
- Double 25 = ___
- Double of ___ is 38
- Double 5 = ___
- Double 4 = ___
Show answers
- 26
- 5
- 36
- 46
- 50
- 19
- 10
- 8
Android app
Times Divide
Multiplication and division worksheets that follow what the child has already solved.
The app does not generate PDF sheets at random. It uses the child’s previous results, including offline sheets, so the next practice can focus on what still needs work.
- Generate printable PDFs from the child’s history.
- Enter solved offline sheets quickly after practice.
- The app shows each answer; you mark it correct or not.
Scan with a phone to open Google Play