Jane drew lines to form triangles and stars. Jane formed a total of 13 triangles and stars. She drew 13 more lines for the stars than for the triangles. How many stars did she form?
Number of
Stars |
Lines drawn
for the stars |
Number of
Triangles |
Lines drawn
for the triangles |
More lines for
the stars |
13
|
13 x 10 =
130 |
0 |
0 |
130 - 0 =
130 |
| 12 |
12 x 10 =
120 |
1 |
1 x 3 =
3 |
120 - 3 =
117 |
| 4 |
4 x 10 =
40 |
9
|
9 x 3 =
27 |
40 - 27 =
13 |
Number of lines drawn if all the shapes were stars
= 13 x 10
= 130
Small difference
= 10 + 3
= 13
Big difference
= 130 - 13
= 117
Number of triangles that Jane drew
= 117 ÷ 13
= 9
Number of stars that Jane drew
= 13 - 9
= 4
Answer(s): 4
