Numbers and the number system
Number sequences
Solving mathematical problems
Challenge Choose one of the numbers on the flags.
Numbers and the number system
1, 10 and 100 Challenge e
80
42
6
300
40
24
60
45
20
250
36
500
Solving mathematical problems
You will need: • set of 0–9 digit cards
Write a sequence that has your number as its middle number. Choose another number and do the same thing.
4 8 3
Now choose any two numbers and write a sequence that has your numbers in it. Repeat, choosing other pairs of numbers.
Shuffle a set of 0−9 digit cards. Choose the top three cards.
Think about …
Write down the numbers. Use the three numbers to make as many different 2-digit and 3-digit numbers as you can.
Think about writing sequences involving steps of 2, 3, 4, 5, 10, 50 or 100.
What is 1, 10 and 100 more than your numbers? Make sure that each sequence contains at least five numbers.
Think about which digit changes when you find 1, 10 or 100 more or less.
What if ? Choose any three numbers and write a sequence that has your numbers in it. 8
What patterns do you notice?
Think about …
Remember that a number sequence can count forwards or backwards.
Choose any two numbers and write a sequence that has your numbers as the two end numbers.
Repeat, using other sets of three digit cards.
When you’v e finished, tur n to page 80.
What if ? What about 1, 10 and 100 less than your numbers? What patterns do you notice?
When does more than one digit change in a number when you find 1, 10 or 100 more or less?
When you’v e finished, tur n to page 80. 9