Answer all the questions below and press submit to see how many you got right.
Digit : A digit is a symbol used in the representation of a number.
Divisible : An integer $x$ is called divisible by an integer $y$ if the division $x:y$ has a remainder of zero. For example 4 is divisible by 2 but 5 is not divisible by 2.
Divisible by 9 : An integer $x$ is called divisible by 9 if $x$ is a multiple of 9. An integer is divisible by 9 if and only if the sum of its digits is divisible by 9.
Division : Division is the mathematical operation that divides objects equally into groups. More generally $x\div y$ is defined as the number that if multiplied by $y$ equals $x.$
Non-zero : Not equal to the number 0.
Number : A number $x$ is a mathematical symbol representing a quantity.
Remainder : In the division of a whole number $x$ by a natural number $y$ the remainder is the unique whole number $r$ with $0\leq r\lt y$ with $x=m\cdot y+r$ for some whole number $m.$ The remainder is the number of leftover wholes in the division. For example the remainder of the division of 14 by 3 is 2 as $14=4\cdot 3+2.$ Remainders are fundamental for the concept of congruence modulo $y$ in number theory.
Sum : A sum is the result of an addition.
Is 7371 divisible by 9? Answer 'y' if it is divisible and 'n' if it is not.
Standard algorithm : By standard algorithm we refer to any one of the algorithms that are commonly taught at school to add, subtract, multiply or divide multi-digit numbers such as long division and partial products multiplication.
What is the remainder in the division 9,921:2?
Partial products method : A method for calculating a product of two multi-digit numbers by writing both numbers as a sum of ones, tens, hundreds and so on, then multiplying each pair of terms and finally summing up all the terms. For example $12\cdot 34=(10+2)\cdot(30+4)$ $=10\cdot 30+10\cdot 4+2\cdot 30+2\cdot 4$ $=300+40+60+8=408.$
What is 19×9?