Multiply by 5 by multiplying by 10 then dividing by 2.

Use finger trick for 9 times multiplication.

Square numbers ending with 5 easily.

Break down addition into parts for easier sums.

Estimate answers to check if they’re reasonable.

Use the distributive property for complex multiplication.

Convert fractions to decimals to compare easily.

Double and halve numbers to simplify multiplication.

Use patterns in multiplication tables.

Round numbers to nearest ten for quick mental math.