Sure thing! We've got 978 and we're gonna multiply it by 20. That's the same as adding 978 to itself 20 times.
Step 1: 0 + 978 = 978
Step 2: 978 + 978 = 1956
Step 3: 1956 + 978 = 2934
Step 4: 2934 + 978 = 3912
Step 5: 3912 + 978 = 4890
Step 6: 4890 + 978 = 5868
Step 7: 5868 + 978 = 6846
Step 8: 6846 + 978 = 7824
Step 9: 7824 + 978 = 8802
Step 10: 8802 + 978 = 9780
Step 11: 9780 + 978 = 10758
Step 12: 10758 + 978 = 11736
Step 13: 11736 + 978 = 12714
Step 14: 12714 + 978 = 13692
Step 15: 13692 + 978 = 14670
Step 16: 14670 + 978 = 15648
Step 17: 15648 + 978 = 16626
Step 18: 16626 + 978 = 17604
Step 19: 17604 + 978 = 18582
Step 20: 18582 + 978 = 19560

So, 978*20 = 19560