Page 112 - steps 3b.pdf

RMl14

Subtraction (2) 3b:28

Secret numbers 2 activities for 2 to 4 players

You need: cards 11- 20 (from RM 100); 20 counters; margarine tub or
similar container; envelope

o Put the number cards in the envelope.

o Take it in turns to play.

o On your turn, take a card and place it face up.

Activity 1 Activity 2
How many How many
are left? are hidden?
e

0 Count out that number of 0 Count out that number of
counters. counters and space them out.
Does everyone agree the Does everyone agree the
number? number?

0 Put all these counters under 0 While everyone else closes
the upturned tub. their eyes, take away some
counters and hide them in
0 While everyone else closes
your hand.
their eyes, take away some
of these counters and place 0 When the others look, they
them in front of you. decide how many are hidden
and write down the number
0 When the others look, they they think.
e decide how many are left and

write down the number they 0 Now show how many
think. counters are in your hand.

0

-=~-

e 0 The next player takes a card from the envelope.

The game carries on like this until all the cards are used up.

© , 993 Collins Educational (an imprint of HarperCollinsPublishers) STEPS 3b Mental subtraction of numbers up to 20 ('take away').