$(-5) \times 4=$
$3 \times 7=$
$8 \times 3=$
$8 \times 5=$
$(-9) \times 7=$
$(-9) \times 1=$
$9 \times 5=$
$7 \times(-6)=$
$(-9) \times(-6)=$
$7 \times(-2)=$
$4 \times 2=$
$(-1) \times 7=$
$(-1) \times 4=$
$9 \times 0=$
$5 \times(-5)=$
$(-9) \times(-4)=$
$3 \times 8=$
$0 \times 0=$
$9 \times(-3)=$
$(-6) \times 4=$

Step 1 ：Given the math problems are $(-5) \times 4$, $3 \times 7$, $8 \times 3$, $8 \times 5$, $(-9) \times 7$, $(-9) \times 1$, $9 \times 5$, $7 \times(-6)$, $(-9) \times(-6)$, $7 \times(-2)$, $4 \times 2$, $(-1) \times 7$, $(-1) \times 4$, $9 \times 0$, $5 \times(-5)$, $(-9) \times(-4)$, $3 \times 8$, $0 \times 0$, $9 \times(-3)$, $(-6) \times 4$

Step 2 ：The product of $(-5) \times 4$ is $-20$

Step 3 ：The product of $3 \times 7$ is $21$

Step 4 ：The product of $8 \times 3$ is $24$

Step 5 ：The product of $8 \times 5$ is $40$

Step 6 ：The product of $(-9) \times 7$ is $-63$

Step 7 ：The product of $(-9) \times 1$ is $-9$

Step 8 ：The product of $9 \times 5$ is $45$

Step 9 ：The product of $7 \times(-6)$ is $-42$

Step 10 ：The product of $(-9) \times(-6)$ is $54$

Step 11 ：The product of $7 \times(-2)$ is $-14$

Step 12 ：The product of $4 \times 2$ is $8$

Step 13 ：The product of $(-1) \times 7$ is $-7$

Step 14 ：The product of $(-1) \times 4$ is $-4$

Step 15 ：The product of $9 \times 0$ is $0$

Step 16 ：The product of $5 \times(-5)$ is $-25$

Step 17 ：The product of $(-9) \times(-4)$ is $36$

Step 18 ：The product of $3 \times 8$ is $24$

Step 19 ：The product of $0 \times 0$ is $0$

Step 20 ：The product of $9 \times(-3)$ is $-27$

Step 21 ：The product of $(-6) \times 4$ is $-24$

Step 22 ：Final Answer: \(\boxed{-20}\)