Page 111 - steps 3b.pdf

RMl13

Subtraction (2) 3b:28

Jump backs A game for 2 players

You need: strip of card about 65 cm long and 10 cm wide; 2 counters;
cards 1 - 20 from RM 100 (you don't need the 0 card); envelope

D Together make a number line like this on a strip of card.
Make the distance between each pair of numbers 3 cm.

- I 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 ~
o 2 3 4 5 6 7 8 q 1 0 1 1 1 2 1 3 14 1 5 1 6 1 7 1 8 1 q 20

D Place the cards in an envelope.

D Take it in turns to play.

D On your turn, take 2 cards from the envelope,
then look at the numbers on them.

D Put counters on the same two numbers on your number line.

D Tell your partner how many you will have to count back from
the higher number to land on the lower number.
Then check your answer.

D If you are right, you win both cards.
Your partner wins them if you are wrong.

D Continue until all the number cards are used up.

D The player with more cards wins the game.

D Play the game again.

, think 1'1/ have to
jump back nine times.

© 1993 Collins Educational (an imprint of HarperCollinsPublishers) STEPS 3b Mental subtraction of numbers up to 20.