145, 150, 155, 160, 165, 170
Let's skip-count by fives. Think of nickels — each one is worth five cents. We'll start at one hundred forty-five and hop up by five.
Here's our number line. We start at one hundred forty-five.
Add five. We land on one hundred fifty.
Add five again. One hundred fifty-five.
Keep hopping. One hundred sixty.
And again. One hundred sixty-five.
One more hop. One hundred seventy.
Look at the ones digit each time — five, zero, five, zero. It always flips between zero and five.
After five jumps of five, we land on one hundred seventy. Skip-counting by fives just means adding five every time.