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3 years ago

Add or subtract mentally 16.9+ 12.1

Mathematics

2 answers:

saul85 [17]3 years ago

7 0

When you add it mentally you'd get 29
When you subtract it mentally you'd get 4.8

Ostrovityanka [42]3 years ago

6 0

Well, just add or subtract it form the back and work your way to the front, and you have to remember what the digit was.

16.9 + 12.1 = 29
16.9 - 12.1 = 4.8

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x = √47

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Trigonometry

[Right Triangles Only] Pythagorean Theorem: a² + b² = c²

Step-by-step explanation:

Step 1: Define

We have a right triangle. We can use PT to solve for the missing side length.

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Leg a = 5

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