What is in the Hexadecimal kit?

10 questions made by rule with fresh numbers every time it is opened, each with an explanation. Decimal to hexadecimal and back, to 255.

Does it cost anything?

A free account opens every kit. Procto AI’s writing runs on a monthly allowance that the free plan includes; a children’s kit uses none of it, because its questions are made by rule.

What happens after the quiz?

The study screen shows the answer and the explanation after each question, then the questions missed, and offers a retry of those. Come back in a few days and take it again: what is still right then is what is known.

Hexadecimal: quiz kit, ages 13 to 16

What it asks

What is hexadecimal 8D in decimal?
141 = 8D: 8 sixteens (8) and 13 (D).
What is hexadecimal 87 in decimal?
135 = 87: 8 sixteens (8) and 7 (7).
What is hexadecimal B1 in decimal?
177 = B1: 11 sixteens (B) and 1 (1).

The facts

Field: Computing and data
Level: ages 13 to 16
Questions: 10, fresh each time
Shape: Maths expression
Made by: rule, in code, no model
Settings: practice: answers at once, retries without limit, no security

About this kit.

Decimal to hexadecimal and back, to 255.

What the computing and data kits are

Programming, algorithms, data structures, databases, networks, security and computing theory: code read and its output given, lines put in order, a program annotated, complexity classified, terms defined. For students, self-learners and hiring.

Why they are built this way

The only honest test of programming is programming. The code shapes here run the candidate's code against tests, ask what a program prints, and ask for the bug. Multiple choice about code tests reading; these test the skill.

How to use them

Use code-read kits to build fluency, code-exec for the real thing. Paste your own code base or documentation for questions on it. For hiring, combine the code shapes with a test from your own stack.

Made by rule

This kit is made in code: every time it opens, the numbers, words or arrangements are drawn fresh from its rule, so the same kit taken twice is two different quizzes from one rule. There is no answer bank to find, and the practice never runs out. Each question carries its explanation, shown at once in study mode.

The shape: maths expression

An equation or expression typed and checked: algebra, calculus and any answer that is a formula rather than a number.

Expressions, numbers and single-form answers are marked by rule, with tolerances and half-credit tolerances where you set them. A typed expression or chemical equation is compared sign for sign, with spacing ignored, so each form you accept is listed, and a slip that would be forgiven in a word is never forgiven here; working and code are marked by a reader against your rubric, step by step.

Taking it

Open it in study mode for the answer and the explanation after each question, and a retry of only what you missed. Switch to exam mode for the real conditions. It comes due again in a few days; the dashboard shows what is due and what you missed last time. Share it with a code for a class, print it as a paper, or host it on a screen for a room.

Questions.

What is in the Hexadecimal kit?: 10 questions made by rule with fresh numbers every time it is opened, each with an explanation. Decimal to hexadecimal and back, to 255.
Does it cost anything?: A free account opens every kit. Procto AI’s writing runs on a monthly allowance that the free plan includes; a children’s kit uses none of it, because its questions are made by rule.
What happens after the quiz?: The study screen shows the answer and the explanation after each question, then the questions missed, and offers a retry of those. Come back in a few days and take it again: what is still right then is what is known.