An orange and an apple are two fruit altogether.

Likewisely, two trucks and three cars "add up" or sum to five vehicles.

From these examples you may deduce that the summation of amounts of objects, even numbers of people, are of a type of general equivalency if so.

Any five people are not any five cars yet both are groupings or sets of five, describable via the comprehension of fiveness of quantity.

Relatedly, the approximately one hundred billion stars (and supermassive black hole: https://en.wikipedia.org/wiki/Sagittarius_A*) comprising our galaxy are not the same as the billions of grains of sand on the beaches of earth.

And yet the sands of earth originate from an ancient supernova explosion (Astronomy).

It's important to know how to count well and correctly.

From Bing: “What gets measured gets managed” is a quote attributed to Peter Drucker¹. The quote suggests that what is measured is more likely to be managed, and what is not measured is more likely to be neglected or mismanaged.

I recommend these counting exercises to enrich and develop, to improve your psyche, your "critical"* thinking skills:

1. Count the amount of money you have, if any, until you know exactly how much money you possess. If you don't have money, count such as your fingers and toes. If you don't have fingers and toes, you can count your inherent abilities as listed on the Four Noble Truths page. Do this latter one if you have money and the rest anyway too!

2. Count the seed spirals of a pinecone (like in the picture below) or similar object in nature until you experience satisfaction (such as from knowing the factuality of Fibonacci numbers in nature (https://en.m.wikipedia.org/wiki/Fibonacci_sequence)).

[Hint: put a finger on the appearance of a spiral and count around a pinecone by each spiraling row until you arrive back at your first finger]

The cowry shells pictured above have much history to them (Cowrie shells were among the devices used for divination by the Kaniyar Panicker astrologers of Kerala, India. [12] In certain parts of Africa, cowries were prized charms, and they were said to be associated with fecundity, sexual pleasure and good luck. | Cowrie - Wikipedia)

If you do the above two exercises virtuously, you will have a robust foundation to learn all mathematics and it would continue to be of benefit to you and those you care about.