missing number, the value that is not shown, equation, a number sentence with an equals sign, unknown, the part you need to find, sum, the answer in addition, difference, the answer in subtraction, addend, a number being added, subtraction, taking one number away from another, solve, find the missing value, augend, starting number in a addition problem, minuend, the first number in substraction, subtrahend, The number you are taking away or subtracting, factors, numbers that are multiplied, product, final result of multiplication, divident, total number you want to divide, divisor, the number you divide by, quotient, total number of division

finding a missing component

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