Page 36 - 01-Yr5_Front cover-ccp.indd

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m Best ways

There are many different ways
to work out difficult multiplications.
34x27 34 34
I \ x 27 x 27
34 34 238 (34 x 7) 340 (34 x 10)
x 20 x 7 + 680 (34 x 20) 340 (34 x 10)
680 238 918 + 238 (34 x 7)
1 - 1- 918
\ 680 - 1-
+ 238
918

ITJ Decide the best way to find the products

of these. Show all your workings-out.

a 45 x 35 b 31 x 12 c 16 x 45
d 57 x 21 e 72 x 26 f 69 x 18

[3J Check each product in ITJ by multiplying
in reverse order. For example, for a you will
calculate 35 x 45.

@] Decide the best way to solve these problems.

a A day trip by coach to Blackpool costs £27
for adults and £16 for children.
If 30 adults and 13 children go, what will be
the total cost of fares?

b Sarah works a 38-hour week at a Blackpool hotel
and has 6 weeks holiday each year.
How many hours does she work
in a complete year?

c A stick of rock is 28 cm long.
What length of rock would be needed
to make a box of 48 sticks?

~ If 25 is the 5th square number,
what is the 42nd square number?

Now try page 31.