Answer:
1.) 5 - 2 + 10 - 5 + 12 = N
= 3 + 10 - 5 + 12 = N
= 13 - 5 + 12 = N
= 8 + 12 = N
= 20
The answer is 20.
2.)30 ÷ 5 × 2 ÷ 3 × 5 = N
= 6 × 2 ÷ 3 × 5 = N
= 12 ÷ 3 × 5 = N
= 4 × 5 = N
3.)
Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).
1. 5 - 2 + 10 - 5 + 12
= 3 + 10 - 5 + 12
= 13 - 5 + 12
= 8 + 12
2. 30 ÷ 5 × 2 ÷ 3 × 5
= 6 × 2 ÷ 3 × 5
= 12 ÷ 3 × 5
= 4 × 5
3. 25 + 3 × 5²
= 25 + 3 × 25
= 25 + 75
= 100
4. 99 + [(6 + 4) ÷ (8 - 3 + 5)]
= 99 + (10 ÷ 10)
= 99 + 1
5. 3 × 3 + 3 ÷ 3 - 3
= 9 + 1 - 3
= 7
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Answers & Comments
Answer:
1.) 5 - 2 + 10 - 5 + 12 = N
= 3 + 10 - 5 + 12 = N
= 13 - 5 + 12 = N
= 8 + 12 = N
= 20
The answer is 20.
2.)30 ÷ 5 × 2 ÷ 3 × 5 = N
= 6 × 2 ÷ 3 × 5 = N
= 12 ÷ 3 × 5 = N
= 4 × 5 = N
= 20
The answer is 20.
3.)
Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right).
1. 5 - 2 + 10 - 5 + 12
= 3 + 10 - 5 + 12
= 13 - 5 + 12
= 8 + 12
= 20
2. 30 ÷ 5 × 2 ÷ 3 × 5
= 6 × 2 ÷ 3 × 5
= 12 ÷ 3 × 5
= 4 × 5
= 20
3. 25 + 3 × 5²
= 25 + 3 × 25
= 25 + 75
= 100
4. 99 + [(6 + 4) ÷ (8 - 3 + 5)]
= 99 + (10 ÷ 10)
= 99 + 1
= 100
5. 3 × 3 + 3 ÷ 3 - 3
= 9 + 1 - 3
= 7