1. Similar Shapes – Area – Bingo Method
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).

2. 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’.

3. BINGO! 45 54 23 82 37 12 76 25 91
Areas of
Similar Shapes

4. Choose your numbers…
2.7
86.2
47.3
43.8
15.8
140
12.6
83.6
184.3
34.4 30
22.9
9.6
5.8
38.9
6.7
Draw a 3x3 grid in your book.

5. These shapes are similar. Find 𝑥.
Area = 𝑥 cm2
Area = 7 cm2
2 cm
5 cm
7 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
2 :5
7 ÷ 4
Find the value
of one piece
of the area ratio.
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
22 :52
𝐴𝑁𝑆×25=𝑥
Multiply to find 𝑥.
4 :25
𝑥=43.8 𝑐𝑚2

6. These shapes are similar. Find 𝑥.
Area = 𝑥 cm2
Area = 14 cm2
3 cm
5 cm
14 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
3 :5
14 ÷9
Find the value
of one piece
of the area ratio.
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
32 :52
𝐴𝑁𝑆×25=𝑥
Multiply to find 𝑥.
9 :25
𝑥=38.9 𝑐𝑚2

7. These shapes are similar. Find 𝑥.
Area = 𝑥 cm2
Area = 22 cm2
5 cm
4 cm
22 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
4 :5
22 ÷16
Find the value
of one piece
of the area ratio.
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
42 :52
𝐴𝑁𝑆×25=𝑥
Multiply to find 𝑥.
16 :25
𝑥=34.4 𝑐𝑚2

8. These shapes are similar. Find 𝑥.
Area = 100 cm2
Area = 49 cm2
𝑥 cm
16 cm
16 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
49 : 100
16 ÷7
Find the value
of one piece
of the area ratio.
7 :10
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
49 :100
𝐴𝑁𝑆×10=𝑥
Multiply to find 𝑥.
𝑥=22.9 𝑐𝑚

9. These shapes are similar. Find 𝑥.
Area = 49 cm2
Area = 25 cm2
𝑥 cm
9 cm
9 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
25 : 49
9 ÷5
Find the value
of one piece
of the area ratio.
5 :7
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
25 :49
𝐴𝑁𝑆×7=𝑥
Multiply to find 𝑥.
𝑥=12.6 𝑐𝑚

10. These shapes are similar. Find 𝑥.
Surface Area = 𝑥 cm2
Surface Area = 72 cm2
8 cm
5 cm
72 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
5 :8
72 ÷25
Find the value
of one piece
of the area ratio.
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
52 :82
𝐴𝑁𝑆×64=𝑥
Multiply to find 𝑥.
25 :64
𝑥=184.3 𝑐𝑚2

11. These shapes are similar. Find 𝑥.
Surface Area = 16 cm2
Surface Area = 9 cm2
2 cm
𝑥 cm
2 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
9 : 16
2 ÷3
Find the value
of one piece
of the area ratio.
3 :4
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
9 :16
𝐴𝑁𝑆×4=𝑥
Multiply to find 𝑥.
𝑥=2.7 𝑐𝑚

12. These shapes are similar. Find 𝑥.
Surface Area = 𝑥 cm2
Surface Area = 35 cm2
3 cm
6 cm
35 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
3 :6
35 ÷1
Find the value
of one piece
of the area ratio.
1 :2
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
12 :22
𝐴𝑁𝑆×4=𝑥
Multiply to find 𝑥.
1 :4
𝑥=140 𝑐𝑚2

13. These shapes are similar. Find 𝑥.
Area = 25 cm2
𝑥 cm
Area = 9 cm2
4 cm
𝑥 cm
4 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
9 : 25
4 ÷3
Find the value
of one piece
of the area ratio.
3 :5
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
9 :25
𝐴𝑁𝑆×5=𝑥
Multiply to find 𝑥.
𝑥=6.7 𝑐𝑚

14. These shapes are similar. Find 𝑥.
Surface Area = 𝑥 cm2
Surface Area = 21 cm2
9 cm
6 cm
21 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
6 :9
21 ÷4
Find the value
of one piece
of the area ratio.
2 :3
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
22 :32
𝐴𝑁𝑆×9=𝑥
Multiply to find 𝑥.
4 :9
𝑥=47.3 𝑐𝑚2

15. These shapes are similar. Find 𝑥.
Surface Area = 49 cm2
Surface Area = 36 cm2
5 cm
𝑥 cm
5 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
36 : 49
5 ÷6
Find the value
of one piece
of the area ratio.
6 :7
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
36 :49
𝐴𝑁𝑆×7=𝑥
Multiply to find 𝑥.
𝑥=5.8 𝑐𝑚

16. These shapes are similar. Find 𝑥.
Area = 81 cm2
Area = 16 cm2
7 cm
𝑥 cm
7 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
16 : 81
7 ÷4
Find the value
of one piece
of the area ratio.
4 :9
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
16 :81
𝐴𝑁𝑆×9=𝑥
Multiply to find 𝑥.
𝑥=15.8 𝑐𝑚

17. These shapes are similar. Find 𝑥.
Surface Area = 𝑥 cm2
Surface Area = 47 cm2
6 cm
8 cm
47 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
6 :8
47 ÷9
Find the value
of one piece
of the area ratio.
3 :4
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
32 :42
𝐴𝑁𝑆×16=𝑥
Multiply to find 𝑥.
9 :16
𝑥=83.6 𝑐𝑚2

18. These shapes are similar. Find 𝑥.
Surface Area = 36 cm2
Surface Area = 25 cm2
8 cm
𝑥 cm
8 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
25 : 36
8 ÷5
Find the value
of one piece
of the area ratio.
5 :6
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
25 :36
𝐴𝑁𝑆×6=𝑥
Multiply to find 𝑥.
𝑥=9.6 𝑐𝑚

19. These shapes are similar. Find 𝑥.
Surface Area = 100 cm2
Surface Area = 16 cm2
12 cm
𝑥 cm
12 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
4 : 25
12 ÷2
Find the value
of one piece
of the area ratio.
2 :5
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
16 :100
𝐴𝑁𝑆×5=𝑥
Multiply to find 𝑥.
4 :25
𝑥=30 𝑐𝑚

20. These shapes are similar. Find 𝑥.
Surface Area = 𝑥 cm2
Surface Area = 44 cm2
7 cm
5 cm
44 : 𝑥
Input values
𝐿𝑒𝑛𝑔𝑡ℎ 𝑅𝑎𝑡𝑖𝑜 ➜
5 :7
44 ÷25
Find the value
of one piece
of the area ratio.
𝐴𝑟𝑒𝑎 𝑅𝑎𝑡𝑖𝑜 ➜
52 :72
𝐴𝑁𝑆×49=𝑥
Multiply to find 𝑥.
25 :49
𝑥=86.2 𝑐𝑚2

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