Numbers and the number system
12 in the middle
Solving mathematical problems
Challenge halleng hallenge g
Numbers and the number system
Showing numbers Challenge
You will need: • Base 10 rods and blocks – tens and ones • abacus
You have 3 tens rods and 5 ones blocks.
12 Using some of these rods and blocks, you can make the number 23. What other numbers can you make using some or all of the rods and blocks?
Write a number pattern that has 12 in the 3rd position. How many different patterns can you make with 12 in the middle?
Think about … What pattern is your sequence going to follow? What is the rule for your pattern?
Think about patterns that count on and patterns that count back.
What if the number 30 is in the middle of your number pattern? How many different patterns can you make?
30 8
Tens
Ones
Think about …
What patterns do you notice as you make your numbers? Can this help you to make other numbers?
What if ?
Solving mathematical problems
Think about using only tens rods or only ones blocks.
What if ?
When you’v e finished, tur n to page 80.
This abacus shows the number 23 using 5 beads. Write all the numbers you can make on an abacus using 5 beads.
When you’v e finished, tur n to page 80. 9