youtube.com

Watch

What is 1+1?

Curated by

hollandsam

1 min read

10 days ago

16

The question "What is 1+1?" is a fundamental concept in mathematics, with the straightforward answer being 2, as demonstrated through various representations including number lines, manipulatives, and real-world examples.

## Basic Arithmetic Explanation

Adding 1 and 1 is a fundamental operation in arithmetic that forms the basis for more complex mathematical concepts. This simple addition can be understood as combining two individual units to create a single, larger quantity. In the base-10 number system used in everyday life, the result of this operation is always 2, expressed verbally as "two". This consistent outcome holds true regardless of the objects or concepts being counted, making it a universal mathematical truth that applies across various contexts and cultures.

1 source

## Visual and Physical Representations

Visual and physical representations can greatly aid in understanding the concept of 1+1=2. A number line provides a clear illustration, showing how moving one unit to the right from 1 leads to 2. For a more tangible approach, manipulatives can be used to demonstrate the addition. For instance, | + | = || visually represents how combining two single units results in a pair. Real-world examples further reinforce this concept:

- One apple plus another apple equals two apples
- One finger plus one finger equals two fingers
- One step plus one step equals two steps

1 source

## Number Line Illustration

The number line provides a clear visual representation of the addition 1+1=2. On this linear graph, starting at the point marked 1 and moving one unit to the right (representing the addition of 1) leads precisely to the point marked 2. This illustration effectively demonstrates the concept of addition as movement along the number line, with each whole number unit representing a step. The number line not only helps visualize this basic addition but also serves as a foundation for understanding more complex mathematical operations and relationships between numbers.

1 source

## Human Computation Times

Interestingly, the speed at which humans compute the simple addition of 1+1 varies with age. According to data from Wolfram|Alpha, typical computation times show a clear progression:

- Age 6: 3.2 seconds
- Age 8: 1.8 seconds
- Age 10: 1.2 seconds
- Age 18: 0.83 seconds

1 source

Related

How do human computation times change with age

What factors influence human computation times

How do visual aids impact computation speed

Are there differences in computation times between addition and subtraction

How does practice affect computation speed in children

Keep Reading