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DecimalsArithmeticElementary schoolabout 0:43

Calculate 90.45 - 21.77: animated lesson

A narrated, step-by-step decimals video lesson with captions. Final answer: 1717/25 ≈ 68.68.

SpeedLanguage

Video with a synthetic English voice and captions. Pick another language for subtitles in that language, or open the interactive version.

Video narrated by a synthetic voice (Piper TTS, en_US-ljspeech-high voice (LJ Speech dataset, public domain)); the steps come from our maths engine and the answer was checked independently. Download MP4 (0.3 MB) · Captions (WebVTT)

Steps on screen

1. The problem
Worked example
$90.45-21.77$
2. Step by step
1. $90.45-21.77$
  Read the expression
2. $90.45-21.77 = \frac{1717}{25}$
  Simplify exactly
3. $90.45-21.77 = \frac{1717}{25} \approx 68.68$
  Evaluate using the order of operations (parentheses, exponents, multiplication and division, addition and subtraction)
3. The answer
$\frac{1717}{25} \approx 68.68$
90.45 - 21.77 = 1717/25 ≈ 68.68
4. Check
- Decimal value: 68.68

Transcript

The problem. Here is the problem: 90.45 minus 21.77. Evaluate a numerical expression.

Step by step. Read the expression. Simplify exactly. Evaluate using the order of operations (parentheses, exponents, multiplication and division, addition and subtraction).

The answer. So the answer is 1717 over 25 approximately 68.68. Operations are applied in the standard order: parentheses, exponents, multiplication and division from left to right, then addition and subtraction from left to right.

Check. Decimal value: 68.68.

About decimals

Add, subtract, multiply and divide decimal numbers, keeping track of the decimal point.

Calculate 90.45 - 21.77: Decimals Step-by-Step Lesson