Double and half
On this page children practise doubling and halving three-digit numbers and connecting the operations as inverse pairs. Start with the short method and the examples, then use the online practice or print a worksheet with answers.
How to solve this
- Doubling and halving are inverse operations: double 35 = 70; half of 70 = 35.
- For doubling larger numbers, split into parts: double 35 = double 30 + double 5 = 60 + 10 = 70.
- Check: (double n) ÷ 2 = n and (half n) × 2 = n — both must hold.
Examples
Double 150
300
Half of 480
240
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 22 = ___
- Half of 130 = ___
- Double 229 = ___
- Half of 80 = ___
- Double 12 = ___
- Half of 100 = ___
- Double 49 = ___
- Double 171 = ___
Show answers
- 44
- 65
- 458
- 40
- 24
- 50
- 98
- 342
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