Page 34 - steps 3b.pdf

35
base 10 materials, 6 Polydran or Clixi squares,
·
d ·
1 .
squared paper, triaoQulor
• S bt rac tIng eCll:na s I' decimal abacus, • Nets for cubes •• dotty paper (RM 148)
U
RM95, calculator
~~~" ~:t'X'l:*I.~
~ { Choose materials PAGE Sq
[I] Subtract these decimals without using a calculator. \. t9 _~ Work with a partner if you can.
a 0·8 - 0·3 b 1·6 - 0·5 c 2·7 - 1·2
d 6·6 - 5·7 e 5·0 - 1·8 f 8·0 - 4·7 Join six squares
to form a 'hexomino'.
[£J Can you fold the hexomino
.~ " ~.(... .. ;""
to make a closed cube?
@] " ;iy;
~~
a [[Jc:J[]]IIDDDEI rn --3.~
Try different hexominoes.
b [[)c:J[I]IIDDDEI
Record your results
cDDDII[gJc:J[gJ1I I CI • .3 on squared paper, like this: []] [!]
O~ .. l l
~
GJ Now try these. Nt!!. Practical: making
a Jack ran a race in 8-4 seconds, Mena was 1·5 seconds faster. closed cubes from
What was Mana's time? }oo t ' (> hexominoes.
b Ginger's tail is 6.3cm long, Whiskey's tail is 4.2cm long. "~ I
How much longer is Ginger's tail than Whiskey's? ~;'
00
CHALLENGE
Recording hexominoes
... ({)
CHALLENGE which make closed
Get some triangular dotty paper. cubes. There are 35
Try drawing and colouring cubes possible hexominoes
of different sizes.
of wh.ich 11 do make
.... -;---:;::;: .... -~
m I STEPS 3b:23 ! I STEPS 3b~241 lml closed cubes and 24
do not.
[]] [!] 00

a 0.5 b 1.1 Open: finding at least 5 a 2.0 ¥~F
pairs of numbers with
c 1.5 d O.g b 5.7
a difference of 0.6.
LEtrcrr=§ not make a closed
e 3.2 f 3.3 (1/3 a,b,d) c 10.7 This hexomino does
~ Challenge cube.
(1/3 a,c)
In each case the result
a 6. g seconds
should be the decimal p~ Challenge
b 2.1 cm started with.
LEtb [] I II I crr=§ different sizes on
Drawing cubes of
triangular dotty paper.