Find the missing number
Practise online with Next and Previous buttons, worked explanations and a report of the questions to review.
Log in to continueKeep both sides of an addition or subtraction equation equal.
One-question preview
Choose one answer
Try this sample, or continue to the online quiz for a practice set with Next and Previous buttons.
What number makes this equation true? 19 + 24 = □ + 19
Show worked steps
Answer: 24
- Calculate the complete side: 19 + 24 = 43.
- Find the missing part: 43 − 19 = 24.
- Check: 19 + 24 = 24 + 19. Both sides equal 43.
- The same addends appear in a different order; their sum stays the same.
This is a question from this topic’s quiz. Preview answers are not saved.
Scratchpad
Working out
Draw with a finger, pen or mouse, or type your working below.
Your working stays on this page. It is not submitted or saved, and clears when you leave or reload.
Curriculum reference
Victorian Curriculum F–10 Version 2.0
VC2M4A01
find unknown values in numerical equations involving addition and subtraction, using the properties of numbers and operations
These quizzes practise concepts within this topic. Multiple-choice answers alone do not demonstrate drawing, conducting an investigation or using a digital tool.
- VC2M4A01-C01Find unknown values in numerical addition equations.
- VC2M4A01-C02Find unknown values in numerical subtraction equations.
- VC2M4A01-C03Use properties of numbers to find unknown values.
- VC2M4A01-C04Use properties of operations to find unknown values.
Learn with worked examples
Help with this topic
Skills in this topic
Traceable coverage
Subskills
Supplied alignment skills
- 01Properties of addition
- 02Complete the addition number sentence
- 03Complete the subtraction number sentence
- 04Complete the addition or subtraction number sentence - up to 100
- 05Balance addition equations
- 06Balance subtraction equations
- 07Balance addition and subtraction equations - up to 100