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## Early math review

### Course: Early math review>Unit 1

Lesson 1: Counting

# Counting with small numbers

Sal counts squirrels and horses.

## Want to join the conversation?

• What is infinite in real life. Like is there anything we can point to in reality that we know is truely infinite?
• In the world of surreal numbers and games, there are many varieties of infinity that are all meaningfully different from each other! Omega (which I'll call w) is what we usually think of as infinity. Varieties of infinity include but are not limited to w, w/2, squareroot(w), w - 1, w + 1, 2w, w^2, etc.

Have a blessed, wonderful day!
• Aren't counting numbers also known as whole numbers? Why are there two different names for the same thing?
• Counting numbers are also known as natural numbers, and are a different set of numbers than whole numbers.

Counting, or natural, numbers are 1, 2, 3, 4, 5, 6, 7, 8, ... (i.e., no negatives or partials).

Whole numbers include all natural numbers, as well as the number 0.

Integers include all whole numbers, and their opposites (i.e., 0, 1 and -1, 2 and -2, 3 and -3, etc.)

There are more sets of numbers, and it can be helpful to think of them in a different context. For example, you might check out this video to see a helpful visual and comparison https://www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-numbers-operations/cc-8th-irrational-numbers/v/categorizing-numbers.
• Which method do you guys prefer when counting? Using your hand or picturing it on your mind?
• Picturing it in my mind. I find it more useful when I am taking the Linear Algebra course of Khan Academy.
• I always find it diffcult to count ,what should I do?
• Keep practicing! And maybe get some help from a teacher or a parent! Good luck!😊
• ㅗㅁㅁㄹㄱㄷㅎㅇㅊㄷㄴㅎㄷㅇㅅ쳘76ㅇ5ㅅ해ㅗㅕ0러렔9ㅗㅛㅅ7ㅕㅛㅑㅗㅗㅓㅐㅎ9ㅑㅑㅎ0ㅑㅡ0[뎃라8ㅇ라ㅑㄹㅇ으
(1 vote)
• 무엇??
(1 vote)
• ㅊㅇㄷㄱㄷ챠ㅛㄷ겨퓩셔ㅛㅠㅍㅎ쇼ㅕ퓨겨ㅛ
(1 vote)
• what does the word counting come from?
(1 vote)
• it comes from Middle English (as a noun): from Old French counte (noun), counter (verb), from the verb computare ‘calculate’ (see compute).
• Are there keyboard shortcuts available to solve the exercise shown in this video without the need of a mouse?

Most exercises on this site seem to be solvable with only the need of a keyboard using tabbed navigation and other similar shortcuts, but I can't tell if that's the case with this one. This might not be an issue at all to most users but it's not that uncommon for someone to be using a portable notebook with a faulty or disabled trackpad
(1 vote)
• Press the "enter" button.
(1 vote)
• Hmm any suggestions on how i could improve this method of learning how to count? my friends son is learning how to count but not at a fast rate.