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How to Balance:

Word equation: Zinc + Oxygen gas → Zinc oxide

Type of Chemical Reaction: For this reaction we have a combination reaction.

Balancing Strategies: In this combination reaction we have zinc plus the oxygen gas and they combine to form zinc oxide.

To balance the equation you'll need to get the oxygen is equal first by changing the coefficient in front of ZnO.

For a complete explanation, watch:

When balancing chemical equations our goal is to have the same number of each type of atom on both sides of the equation.

Only change the coefficients (these are the numbers in front substances).
Never change the subscripts (the small numbers after elements).