Video Transcript
What are the three missing numbers
in this table?
We’re shown a multiplication
table. And we’re multiplying by three. We have to multiply the numbers in
the top row by three. One times three is three. Two times three is six. Now, we’ve reached a missing
number. What is three times three? Here are three groups of three. One three is three, two threes are
six, three threes are nine. So, we know the first missing
number is nine.
Three, six, nine, 12, 15, 18. To find this missing number, we
have to multiply seven lots of three. What is seven times three? We know that six threes are 18. This is the last number in our
table before the missing number. We know that seven threes are three
more than 18. Seven times three is 21. Three more than 18 is 21. We found our second missing
number.
Three, six, nine, 12, 15, 18, 21,
24, 27. What’s our last missing number? What is 10 times three? 10 times three is one of the
multiplication facts in the three times table that’s quite easy to remember. 10 times three is 30. We modeled groups of three to help
us multiply by three. Three, six, nine, 12, 15, 18, 21,
24, 27, 30. The missing numbers are nine, 21,
and 30.
