Or search by topic
There are 4 NRICH Mathematical resources connected to NC-MentalCalculationMD-R3-Y5, you may find related items under NC.
Broad Topics > NC > NC-MentalCalculationMD-R3-Y5Have a go at balancing this equation. Can you find different ways of doing it?
Can you work out some different ways to balance this equation?
Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?
Do you agree with Badger's statements? Is Badger's reasoning 'watertight'? Why or why not?