More arithmetic rules: subtraction of a sum, subtraction of a difference, division by product, and division by quotient

In this article, we will dive into the world of essential arithmetic rules that are fundamental for tackling a wide variety of mathematical exercises. Mastering these rules will provide you with a solid foundation and allow you to solve problems with greater confidence and precision. From basic operations like addition and subtraction to more advanced concepts like the division of products and quotients, we will explore each of these rules in detail. Are you ready to deepen your mathematical skills?
Let's get started!

Suggested Topics to Practice in Advance

  1. The commutative property
  2. The Commutative Property of Addition
  3. The Commutative Property of Multiplication
  4. The Distributive Property
  5. The Distributive Property for Seventh Graders
  6. The Distributive Property of Division
  7. The Distributive Property in the Case of Multiplication
  8. The commutative properties of addition and multiplication, and the distributive property
  9. The Associative Property
  10. The Associative Property of Addition
  11. The Associative Property of Multiplication

Practice Additional Arithmetic Rules

Examples with solutions for Additional Arithmetic Rules

Exercise #1

21:(30:10)= 21:(30:10)=

Video Solution

Step-by-Step Solution

We will use the formula:

a:(b:c)=a:b×c a:(b:c)=a:b\times c

Therefore, we will get:

21:30×10= 21:30\times10=

Let's write the division exercise as a fraction:

2130=710 \frac{21}{30}=\frac{7}{10}

Now let's multiply by 10:

710×101= \frac{7}{10}\times\frac{10}{1}=

We'll reduce the 10 and get:

71=7 \frac{7}{1}=7

Answer

7 7

Exercise #2

15:(2×5)= 15:(2\times5)=

Video Solution

Step-by-Step Solution

We will use the formula:

a:(b×c)=a:b:c a:(b\times c)=a:b:c

Therefore, we get:

15:2:5= 15:2:5=

Let's write the exercise as a fraction:

1525= \frac{\frac{15}{2}}{5}=

We'll convert it to a multiplication of two fractions:

152×15= \frac{15}{2}\times\frac{1}{5}=

We multiply numerator by numerator and denominator by denominator, and we get:

1510=1510=112 \frac{15}{10}=1\frac{5}{10}=1\frac{1}{2}

Answer

112 1\frac{1}{2}

Exercise #3

12:(2×2)= 12:(2\times2)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

2×2=4 2\times2=4

Now we divide:

12:4=3 12:4=3

Answer

3 3

Exercise #4

7(4+2)= 7-(4+2)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

4+2=6 4+2=6

Now we solve the rest of the exercise:

76=1 7-6=1

Answer

1 1

Exercise #5

8(2+1)= 8-(2+1)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

2+1=3 2+1=3

Now we solve the rest of the exercise:

83=5 8-3=5

Answer

5 5

Exercise #6

13(7+4)= 13-(7+4)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

7+4=11 7+4=11

Now we subtract:

1311=2 13-11=2

Answer

2 2

Exercise #7

38(18+20)= 38-(18+20)=

Video Solution

Step-by-Step Solution

According to the order of operations, first we solve the exercise within parentheses:

18+20=38 18+20=38

Now, the exercise obtained is:

3838=0 38-38=0

Answer

0 0

Exercise #8

28(4+9)= 28-(4+9)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

4+9=13 4+9=13

Now we obtain the exercise:

2813=15 28-13=15

Answer

15 15

Exercise #9

55(8+21)= 55-(8+21)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

8+21=29 8+21=29

Now we obtain the exercise:

5529=26 55-29=26

Answer

26 26

Exercise #10

37(47)= 37-(4-7)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

47=3 4-7=-3

Now we obtain:

37(3)= 37-(-3)=

Remember that the product of a negative and a negative results in a positive, therefore:

(3)=+3 -(-3)=+3

Now we obtain:

37+3=40 37+3=40

Answer

40 40

Exercise #11

80(412)= 80-(4-12)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

412=8 4-12=-8

Now we obtain the exercise:

80(8)= 80-(-8)=

Remember that the product of plus and plus gives us a positive:

(8)=+8 -(-8)=+8

Now we obtain:

80+8=88 80+8=88

Answer

88 88

Exercise #12

100(3021)= 100-(30-21)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

3021=9 30-21=9

Now we obtain:

1009=91 100-9=91

Answer

91 91

Exercise #13

66(1510)= 66-(15-10)=

Video Solution

Step-by-Step Solution

According to the order of operations rules, we first solve the expression inside of the parentheses:

1510=5 15-10=5

We obtain the following expression:

665=61 66-5=61

Answer

61 61

Exercise #14

22(283)= 22-(28-3)=

Video Solution

Step-by-Step Solution

According to the order of operations, we first solve the exercise within parentheses:

283=25 28-3=25

Now we obtain the exercise:

2225=3 22-25=-3

Answer

3 -3

Exercise #15

60:(5×3)= 60:(5\times3)=

Video Solution

Step-by-Step Solution

We write the exercise in fraction form:

605×3 \frac{60}{5\times3}

We break down 60 into a multiplication exercise:

20×35×3= \frac{20\times3}{5\times3}=

We simplify the 3s and obtain:

205 \frac{20}{5}

We break down the 5 into a multiplication exercise:

5×45= \frac{5\times4}{5}=

We simplify the 5 and obtain:

41=4 \frac{4}{1}=4

Answer

4 4

Topics learned in later sections

  1. Subtracting Whole Numbers with Addition in Parentheses
  2. Division of Whole Numbers Within Parentheses Involving Division
  3. Subtracting Whole Numbers with Subtraction in Parentheses
  4. Division of Whole Numbers with Multiplication in Parentheses