WEBVTT
00:00:02.730 --> 00:00:10.590
Seven plus seven plus seven plus seven equals the missing number multiplied by four.
00:00:12.340 --> 00:00:17.620
Seven plus seven plus seven plus seven is repeated addition.
00:00:18.020 --> 00:00:20.060
We keep on adding seven.
00:00:21.680 --> 00:00:32.260
Letâ€™s count the number of sevens we need to add: one, two, three, four.
00:00:33.780 --> 00:00:39.020
Adding together four sevens is the same as multiplying by four.
00:00:41.690 --> 00:00:48.450
That means that seven multiplied by four is the same as adding four sevens.
00:00:49.090 --> 00:00:51.540
So the missing number is seven.
00:00:52.100 --> 00:00:58.760
Seven plus seven plus seven plus seven equals seven multiplied by four.