3 × 10
Three times ten — let's find a fast way to solve it.
Three times ten means three equal groups of ten.
Skip-count by tens for each group: ten, twenty, thirty.
Look closely: three became thirty. We just added a zero!
That's the pattern: when you multiply by ten, slide the digit over and add a zero.
Let's try it with six times ten.
Six became sixty — the pattern works every time!
So three times ten equals thirty. Slide over, add a zero, and you're done!