How do I multiply a triple digit number by a double digit?145 x 67 = ?267 x 19 = ?Im sure that youll agree that there are many methods that we can use.Which method do you feel most comfortable with?Try your method to solve one of the problems on this page. When you are finished, explain your method to your partner.156 x 14 = ?243 x 15 = ?142 x 12 = ?142 x 14 = ?262 x 15 = ?

Heres a new method for you to try!My problem is: 145 x 13 = ?Step one:Break the numbers up into their different parts.145 = 100 + 40 + 513 = 10 + 3Step two:Fill the numbers onto a grid like this.100405103x

Step 3:Begin to cross multiply each number filling the answer into the grid.(This is just like filling in a multiplication square.)100405103x10004005030012015Step 4:Add up each row of numbers and put your total at the side of the column.1004053x100040050300120151450435

Step 5:Simply add the two numbers together to get your final answer. 1 4 5 0+ 4 3 5 1 8 8 5How easy is that?Therefore:145 x 13 = 1885

Challenge!Can you use this new method to solve the problem below?

134 x 15 = ?

We can use this grid to solve problems together.