Question

draw a number line and show all numbers that are between 1 and 20 and have exactly 4 factors

Answer 1

Answer:

1 = 1×1

(1 factor)

2= 1×2

(one factor)

3=1×3

(one factor )

4= 4×1

2×2

(two factor)

5= 1×5

(one factor )

6= 1×6 , 2×3, 3×2

(three factors )

7 = 1×7

(one factor )

8 =1×8 , 2×4 , 4×2

(three factors )

9 = 1×9 , 3×3

(two factors )

10 = 1×10 , 2×5 , 5×2

(three factors )

11 = 1×11

( one factor )

12 = 1×12, 2×6 , 6×2 , 3×4

( four factors)

13 =1×13

( one factor )

14 = 1×14, 2×7 ,7×2

(three factors )

15 = 1×15, 3×5 , 5×3

(three factors )

16 = 1×16, 2×8 , 8×2

(three factors )

17 = 1×17

(one factor )

18 = 1×18, 2×9 ,9×2, 3×6

( four factors )

19 = 1×19

( one factor )

20 = 1×20 , 2×10, 10×2, 5×4 , 4×5

( five factors)

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hope you understand ☺