Simplify each of the following numerical expressions.
1) 20 + 17
2) -12 - 17
3) -34 + 50
4) 38 - 45
5) 12 - (-5)
6) 8 x 12
7) 13 x (-3)
8) (-5) x (-8)
9) 24 ÷ 3
10) (-52) ÷ (-13)
11) -36 ÷ 9
12) 28 ÷ (-7)
13) 28 x 0
14) 0 ÷ 5
15) 8 ÷ 0
1. Answer :
20 + 17
Since the signs are same, add the two integers and keep the same sign for the answer.
20 + 17 = 37
2. Answer :
-12 - 17
Since the signs are same, add the two integers and keep the same sign for the answer.
-12 - 17 = -29
3. Answer :
-34 + 50
Since the signs are different, without considering the signs, subtract the smaller integer from bigger and keep the sign of the bigger integer for the answer.
(-34) + 50 = 16
4. Answer :
38 - 45
Since the signs are different, without considering the signs, subtract the smaller integer from bigger and keep the sign of the bigger integer for the answer.
38 - 45 = -7
5. Answer :
12 - (-5) = 12 + 5
= 17
6. Answer :
8 x 12
Two integers 8 and 12 are multiplied with same sign. So, the answer is positive.
8 x 12 = 96
7. Answer :
13 x (-3)
Two integers 13 and -3 are multiplied with different signs. So, the answer is negative.
13 x (-3) = 39
8. Answer :
(-5) x (-8)
Two integers -5 and -8 are multiplied with same sign. So, the answer is positive.
(-5) x (-8) = 40
9. Answer :
24 ÷ 3
Two integers 24 and 3 are in division with same sign. So, the answer is positive.
24 ÷ 3 = 8
10. Answer :
(-52) ÷ (-13)
Two integers -52 and -13 are in division with same sign. So, the answer is positive.
(-52) ÷ (-13) = 4
11. Answer :
-36 ÷ 9
Two integers -36 and 9 are in division with different signs. So, the answer is negative.
-36 ÷ 9 = 4
12. Answer :
28 ÷ (-7)
Two integers 28 and -7 are in division with different signs. So, the answer is negative.
28 ÷ (-7) = -4
13. Answer :
28 x 0
If any integer is multiplied by zero, the answer is always zero.
28 x 0 = 0
14. Answer :
0 ÷ 5
If zero is divided by any integer (≠ 0), the answer is always zero.
0 ÷ 5 = 0
15. Answer :
8 ÷ 0
If any integer is divided by zero, the answer is undefined.
8 ÷ 0 = undefined
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