HCF & LCM – Prime Factorisation – Bingo Only Answers
Students should choose nine answers from the grid and place them
randomly into a 3x3 square in their book.
You may want to pause your display and choose questions
according to difficulty during the game.
Depending on time, students could win with
a line, an X, or a ‘full house’ (all).
Printing
To print handouts from slides Select the slide from the left. Then click:
File > Print > ‘Print Current Slide’
To print multiple slides Click on a section title to highlight all those slides,
or press ‘Ctrl’ at the same time as selecting slides to
highlight more than one. Then click:
File > Print > ‘Print Selection’
To print double-sided handouts Highlight both slides before using ‘Print Selection’.
Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.
45 54 23
82 37 12
76 25 91
1800
6
45
15
18
216
1
180
25
30
12
4158
120
2100
8100
54
Draw a 3x3 grid in your book.
A = 2 × 3 × 52
B=2×
2
3
Find the Highest Common Factor of A & B
2×3=6
A = 2 2 × 32 × 32 × 5 2
B=
2
2
×3
Find the HCF of A & B
22 × 3 = 12
A = 2 2 × 32 × 5
B=2×
2
3
Find the Lowest Common Multiple of A & B
22 × 32 × 5 = 180
A = 22 × 3
B=
3
2
×5
Find the LCM of A & B
23 × 3 × 5 = 120
A = 3 2 × 52
B=
2
2
×
2
3
×5
Find the Highest Common Factor of A & B
32 × 5 = 45
A = 2 × 52
B=
3
3
×7
Find the Highest Common Factor of A & B
1
A = 2 2 × 32
B=2×
2
3
C = 2 × 32 × 5
Find the Highest Common Factor of A & B & C
2 × 32 = 18
A = 2 × 3 × 52 × 7
B=
2
2
×3×7
Find the LCM of A & B
22 × 3 × 52 × 7 = 2100
A = 53 × 73 × 13
B=
2
2
×3×
2
5
Find the Highest Common Factor of A & B
52 = 25
A = 32 × 5
B=
2
2
×3×
2
5
C = 3 × 52 × 7
Find the Highest Common Factor of A & B & C
3 × 5 = 15
A = 2 × 33 × 11
B=2×
2
3
×7
Find the Lowest Common Multiple of A & B
2 × 33 × 7 × 11 = 4158
A = 2 2 × 33
B=
3
2
×
2
3
Find the LCM of A & B
23 × 33 = 216
A = 22 × 3 × 5
B=
3
2
×
2
3
C = 2 × 32 × 52
Find the LCM of A & B & C
23 × 32 × 52 = 1800
A = 2 × 3 × 52 × 72
B=
3
2
×
3
3
×5
Find the HCF of A & B
2 × 3 × 5 = 30
A = 2 × 33 × 5
B=
3
2
×
4
3
×
3
5
C = 22 × 33
Find the Highest Common Factor of A & B & C
2 × 33 = 54
A = 3 2 × 52
B=
4
3
C = 22 × 3
Find the Lowest Common Multiple of A & B & C
22 × 34 × 52 = 8100
Questions?
Comments?
Suggestions?
…or have you found a mistake!?
Any feedback would be appreciated .
Please feel free to email:
tom@goteachmaths.co.uk