Let's roll up our sleeves and solve this. We have 978 and we're going to multiply it by 3, essentially adding 978 to itself 3 times.
Step 1: 0 + 978 = 978
Step 2: 978 + 978 = 1956
Step 3: 1956 + 978 = 2934

So, 978*3 = 2934