In math, it is common to round to the nearest whole number or the nearest ten to make calculations easier. One tool that can help with rounding is making a number line. No calculator is needed.
Know MoreA number line is a line on which numbers (usually whole numbers) are labeled. They increase as they go from left to right. Put 148 at the center of your number line.
Mark the line for each new number and write the numbers in sequence before and after 148. For visual clarity, try to keep the space between the marks even. Because you know you're rounding to the nearest multiple of 10, underline the numbers with a zero in the ones' place.
On the number line with 148 in the center, it is easy to see that 150 is much closer than 140. This means that 150 is the nearest multiple of 10 to 148. You can also count the number of marks between your number and the nearest 10, assuming one mark for each number. Rounding to the nearest 10 means increasing or decreasing the number by a relatively small amount, so you won't need to change any number by more than five. Digits zero through four round down, and digits five through nine round up.
A number model in math is a sentence that illustrates how the parts of a number story are related. The equation may include addition, subtraction, division and multiplication and may be expressed as words or in number form.
Full Answer >Rational numbers are any numbers that can be expressed by a fraction with integers in both the numerator and the denominator. The amount of time and paper it takes to put them into an increasing line depends on how many numbers there are and how big of a range they have.
Full Answer >To round numbers, decide on the place to which to round. Round up if the digit itself or the digit to its right is five or greater, and round down if the number is less than five. Rounding a number means to reduce its digits while keeping the value similar.
Full Answer >Friendly numbers are individual numbers that make up part of what is known as a friendly pair. Friendly numbers always come in sets of two, and they are known for having a positive density.
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