10L.O.2To be able to extend written methods to multiplication of U.t x UTo be able to approximate first.
11Q. How would you calculate 57 x 6? Q. How would you calculate 5.7 x 6? Answers please……..Q. How would you approximate the answer?
12Look:XIf you find it hard to calculate 0.7 x 6 try counting on in 0.7s and see if your answer is one tenth of 7x6.
13Complete the worksheet. Work in pairs. 5 minutes
14Here is a problem:If 26 children each have a ruler measuring 30cm. and they are arranged end to end to form a line, how long would the line of rulers be?With a partner think about how you would do this.
15We would need to do the calculation 30cm x 26. We can write this as 0.3m. x 26 !These numbers allow the calculation to be done mentallyi.e3 x 26 and make it 10 times bigger for 30cm cm3 x 26 and make it 10 times smaller for m.
16Try doing the problem if the rulers each measure 32 cm. Half of you are to work in cm. & the other half in metres.Remember to approximate first.Q. Will the answers be the same?
176.3 x 7 = 42.21 Q. Is the answer correct? Has anything gone wrong? Why?
18Q. How would you work out the answer ? 6.5 x 4Q. How would you work out the answer ?Is there an easier way?Mentally. the 0.5
19Multiply a simple decimal with one decimal place by a single digit. By the end of the lesson the children should be able to:Approximate first;Multiply a simple decimal with one decimal place by a single digit.