The divisibility rule for 7 dictates that a number is divisible by 7 if subtracting 2 times the digit in the one's column from the rest of the number, now excluding the one's column digit, yields a number that is divisible by 7 or 0. Divisibility rules are simple rules that can be used to quickly determine if a number is divisible by a smaller number without a calculator.
Continue ReadingTo determine if the number 672 is divisible by 7, start by multiplying the last digit by 2, which in this case results in 4. Subtracting this from the rest of the number, 67 minus 4, yields 63. Since 63 can be divided by 7 evenly to result in 9, it is simple to conclude that 672 is divisible by 7.
Learn more about ArithmeticTo perform partial product multiplication, you use the distributive property of numbers, multiplying each digit of a number by each digit of the other number and adding the results while taking the place value of each digit into account. One of the most common types of multiplication problems involves a pair of two-digit numbers. When working with these problems, add a total of four partial products.
Full Answer >For each represented digit on a Touch Math number chart, a small number of "touch points," or small dots whose quantity is equal to the numerical value of a given digit, are added. Touch Math charts may include arithmetical concepts such as addition, subtraction and multiplication or may simply be designed to help children learn to count to 10. The charts generally are not extremely graphically detailed or complex, as they are aimed at young children.
Full Answer >Round each number in the question to only have one non-zero digit. For example, 64 becomes 60, and 1,890 becomes 2,000. Then do the calculation required.
Full Answer >To tell if a number is evenly divisible by three, add all the digits in it until you arrive at a single digit. For instance, the number 9234 adds up to 18, which adds up to nine. Nine is evenly divisible by three, so 9234 is evenly divisible by three.
Full Answer >