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…estimate
…estimate

... This is close to the accurate answer (1.02 x 1.68 = 1.71 square metres). ...
math class study guide
math class study guide

... Use all steps. Show regroupings. Line up place value columns. ...
Round 2-Digit and 3-Digit Numbers
Round 2-Digit and 3-Digit Numbers

... Also KEY NS 1.3 , MR 1.1, MR 2.3, MR 2.4, MR 2.5 ...
Rounding to the Nearest Ten and Hundred
Rounding to the Nearest Ten and Hundred

... Topic C builds on students’ Grade 2 work with comparing numbers according to the value of digits in the hundreds, tens, and ones places (2.NBT.4). Lesson 12 formally introduces rounding two-digit numbers to the nearest ten. Rounding to the leftmost unit usually presents the least challenging type of ...
Chapter 1 Notes - Clinton Public Schools
Chapter 1 Notes - Clinton Public Schools

...  The numbers {1, 2, 3, 4, 5, 6, …} are called natural numbers or counting numbers. A natural number is even if it is divisible by two with no remainder. Otherwise the natural number is odd. The whole numbers include the natural numbers and zero.  If one natural number divides evenly into another, ...
W-L Ch.13, 3,4,5
W-L Ch.13, 3,4,5

... A. Front-End: The front-end method uses the leftmost digits only and covers up all the other digits. For example, in a multiplication problem, 37 x 55, students consider just the 3, 30 and the 5, times 50, which would be 1500. B. Rounding: Rounding changes the numbers in the problem to others that a ...
136 Cultural Foundations of Mathematics Rounding Again A notable
136 Cultural Foundations of Mathematics Rounding Again A notable

... A notable feature of the above calculation is the systematic (though implicit) way in which insignificant quantities are discarded or “zeroed”, through rounding. The “general” rule for rounding was rounding to the nearest integer, so that a quantity greater than 12 was rounded up to the next higher ...
AIMS Exercise Set # 1 Peter J. Olver
AIMS Exercise Set # 1 Peter J. Olver

... 1. Determine the form of the single precision floating point arithmetic used in the computers at AIMS. What is the largest number that can be accurately represented? What is the smallest positive number n1 ? The second smallest positive number n2 ? Which is larger: the gap between n1 and 0 or the ga ...
Decimal Operations – NOTES
Decimal Operations – NOTES

... Compatible Numbers: Numbers that add up to values that are easy to compute with mentally, like 10 or 100. Example: 4 & 6, 7 & 3, and 8 &2 are pairs of compatible numbers because they add up to 10. Compensation: Adjust one number to make the calculation easier and then make up for that change after t ...
Estimate Sums
Estimate Sums

... You can use rounding to estimate sums. Round to estimate the sum of 477 + 592. Step 1 Round each addend to the nearest hundred. 477 rounds to 500. 592 rounds to 600. Step 2 Add the rounded numbers. 500 + 600 = 1,100 Step 3 You can get a closer estimate by rounding to a lesser place value. Rounding t ...
A digit A number Expanded form Increasing order Decreasing order
A digit A number Expanded form Increasing order Decreasing order

... Any whole number that ends with the digits 1, 3, 5, 7 or 9 ...
Math 11e
Math 11e

... Rounding is making large, detailed numbers close to a desired, manageable place value. For example, the number 3.142857142857 is a large detailed number that can be rounded to the nearest “hundredth” to create the number 3.14. Rounding is simply picking a place value you wish to round to, identifyin ...
A digit A number Expanded form Increasing order Decreasing order
A digit A number Expanded form Increasing order Decreasing order

... Any whole number that ends with the digits 1, 3, 5, 7 or 9 ...
Estimating Sums and Differences of Whole Numbers
Estimating Sums and Differences of Whole Numbers

... Estimating Sums and Differences of Whole Numbers ...
< 1 ... 11 12 13 14 15

Rounding

Rounding a numerical value means replacing it by another value that is approximately equal but has a shorter, simpler, or more explicit representation; for example, replacing £23.4476 with £23.45, or the fraction 312/937 with 1/3, or the expression √2 with 1.414.Rounding is often done to obtain a value that is easier to report and communicate than the original. Rounding can also be important to avoid misleadingly precise reporting of a computed number, measurement or estimate; for example, a quantity that was computed as 123,456 but is known to be accurate only to within a few hundred units is better stated as ""about 123,500.""On the other hand, rounding of exact numbers will introduce some round-off error in the reported result. Rounding is almost unavoidable when reporting many computations — especially when dividing two numbers in integer or fixed-point arithmetic; when computing mathematical functions such as square roots, logarithms, and sines; or when using a floating point representation with a fixed number of significant digits. In a sequence of calculations, these rounding errors generally accumulate, and in certain ill-conditioned cases they may make the result meaningless.Accurate rounding of transcendental mathematical functions is difficult because the number of extra digits that need to be calculated to resolve whether to round up or down cannot be known in advance. This problem is known as ""the table-maker's dilemma"".Rounding has many similarities to the quantization that occurs when physical quantities must be encoded by numbers or digital signals.A wavy equals sign (≈) is sometimes used to indicate rounding of exact numbers. For example: 9.98 ≈ 10.
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