Chapter 2 Our Number System, Addition And Subtraction Examples And Worksheet Page 9
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OUR NUMBER SYSTEM, ADDITION AND SUBTRACTION (CHAPTER 2)
For example, the largest 6 digit number
the smallest 6 digit number
the largest even number with 5 digits....
The leader takes the first card from the shuffled pile and displays it.
Players decide where they will write this digit on their chart and do so. Once it is written
it cannot be changed. Players use a pencil to write numbers in.
The leader draws the next card and the players write the next digit in position.
You ‘win’ if you get the described number. Games can be ‘rubbed out’ and new games
played on the same place value chart.
Activity B
You will need: a set of game cards
What to do:
1 Elect a ‘runner’ to take cards to where the number is to be built.
2 Your teacher will distribute some cards to your group. Arrange them so the largest
number is on the left, smallest to the right.
3 Listen carefully to the target number as it is called, for example, twenty four thousand,
six hundred and seven.
4 Help build the number using cards from your group’s collection. The ‘runner’ takes
them one at a time to where the number is being built. The first group to use all
their cards wins. First correctly placed card is accepted.
Activity C
You will need:
place value chart, numbered cards
What to do:
1 Your teacher will give you a set of numbered cards and a place value chart for your
group. Sort your cards from largest to smallest value.
2 Listen carefully for the target number. For example, the target number might be a
number as close to 10 000 as you can, a 5 place number whose digits add to 20.....
3 Your group needs to use the materials to build a number as close to the given one as
you can. Cards may be overlapped once but once placed must be left in position.
4 Play 1 minute per round. The group closest to the target, or those ‘on’ target, score
1 point. The first to 5 points wins.
D
ROUNDING OFF NUMBERS
Sometimes we do not need to know the exact number of objects.
For example:
² You may look at a handful of marbles and say, “There are about thirty there.”
² A newspaper report might read “About 600 kg of crayfish was caught last week.”
² A commentator might estimate the crowd at the sporting event as 85 000.
When we give an estimate of a number of objects we usually round to the nearest 10, 100,
1000, 10 000 and so on. There are rules for doing this.
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