Simple
Medium
Hard
100

3x +9

3(x+3)

100

6x+36

6(x+6)

100

9x+81

9(x+9)

200

4x+16

4(x+4)

200

8x+64

8(x+8)

200

9x+90

9(x+10)

300

5x+25

5(x+5)

300

7x+42

7(x+6)

300

10x + 100

10(x + 10)

400

7x+14

7(x+2)

400

4x+36

4(x+9)

400

3x+5

3x + 5 (cannot be factorized)

500

2x+20

2(x+10)

500

17x+35

17x+35(cannot be factorized)

500

12x+156

12(x+13)

M
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