Objectives:
•
Find factors of two-digit numbers;
•
Identify multiples of 2, 3, 4, 5, 6, 7 and 9.
© Hamilton Trust
Keeping Up Term 1
Week 9 Day 2
What is a factor?
What is a multiple?
• 1, 5 and 25 are factors
of 25
• 25 is a multiple of 5
• 1, 2, 3, 4, 6 and 12 are
factors of 12
• 30 is a multiple of 2,
3, 5, 6, 10 and 15
• 1, 2, 4, 5, 10 and 20
are factors of 20
• 40 is a multiple of 2,
4, 5, 8, 10 and 20
© Hamilton Trust
Keeping Up Term 1
Week 9 Day 2
What are the factors of 18?
18
1
2
18
6
3
© Hamilton Trust
9
Keeping Up Term 1
Week 9 Day 2
Highlight a number on the 100 square.
Highlight a factor or multiple of the first number.
Continue to highlight numbers, that are factors or multiples of the
previous number.
Try to find the longest sequence of numbers that can be highlighted.
Each number can only appear once in a sequence!
© Hamilton Trust
Keeping Up Term 1
Week 9 Day 2
Work in pairs
Find longest sequence of numbers that can be crossed
out on your own 1-100 square…
Start with 25.
Highlight 5 as a factor of 25
Highlight 50 as a multiple of 25
Highlight 75 and 100 as
multiples of 25
This is a sequence of five
numbers
© Hamilton Trust
Keeping Up Term 1
Week 9 Day 2
Choose 5 of these numbers and write a list of
all of their factors.
1
36
42
60
57
49
35
100
Did the largest number have the most factors?
© Hamilton Trust
Keeping Up Term 1
Week 9 Day 2
1. Write the factors of 42.
2. Is 3 a factor of 42?
3. Write one number which is a multiple of
both 5 and 6.
4. Write a number which is a factor of both
21 and 49.
5. Write the factors of 56.
© Hamilton Trust
Keeping Up Term 1
Week 9 Day 2