Page 83 - STEPS MATHEMATICS 4A

Rod problems Cuisenaire Rods,
metre rule (if wanted)

Here are the Cuisenaire Rods, drawn half-scale, with their colours and lengths.

white 1 cm
orange 10cm

blue 9cm
tan 8cm

yellow 5cm
black 7cm red 2cm

pink 4cm
dark green 6cm
light green 3cm

Work out the answers to these problems without using real rods.
Write down what you do to show your teacher.

Afterwards, check with rods and a metre rule, if you want.

Find the total length these will make, fitted end to end.

a 3 red and 4 black rods b 5 pink and 2 blue rods
c 8 tan rods and 5 light green rods d 6 orange and 5 dark green rods
e 9 yellow and 5 blue rods f 8 black and 4 blue rods
g 9 light green and 8 dark green rods h 7 yellow and 7 pink rods

Each set of these rods, fitted end to end, will equal 64 cm.
Find the missing number or colour in each set.

a 5 tan and ..... light green rods b ..... tan and 8 pink rods
c ..... orange and 7 red rods d 4 ........ and 6 dark green rods
e 6 blue and 5 ........ rods f ..... black and 3 yellow rods

CHALLENGE

Find the missing numbers or colours.
•7 ...... and 3 ...... rods equal 42cm.
«... yellow and ... green rods equal 43cm.