### Video Transcript

Complete: 10 times eight is equal to 30 plus what.

First, we need to calculate 10 times eight. One times 10 is 10. Two 10s are 20. Three times 10 is 30. Four 10s are 40. Five 10s are 50. Six tens are 60. Seven 10s are 70. And eight tens are 80. Now, we know that 10 times eight is 80. We can work out what to add to 30 to make 80. We can start at 30 and count in 10s until we reach 80. 10, 20, 30, 40, 50. 10 times eight is equal to 30 plus 50. The missing number is 50.