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  2. Number bond - Wikipedia

    en.wikipedia.org/wiki/Number_bond

    Number bonds are often learned in sets for which the sum is a common round number such as 10 or 20. Having acquired some familiar number bonds, children should also soon learn how to use them to develop strategies to complete more complicated sums, for example by navigating from a new sum to an adjacent number bond they know, i.e. 5 + 2 and 4 ...

  3. How To Fill Out a W-4: A Complete Guide - AOL

    www.aol.com/finance/fill-w-4-complete-guide...

    Deductions Worksheet – Step 4(b) on page 3 ... If you fill out Step 3, multiply the number of children under age 17 by $2,000 and put the amount on the line. For all other dependents, multiply ...

  4. Worksheet - Wikipedia

    en.wikipedia.org/wiki/Worksheet

    The W-4 form allows the employee to pick an exemption level to reduce the tax factoring (to avoid overpayment), or specify an extra amount above the standard number (to avoid underpayment). The form comes with two worksheets, one to calculate exemptions, and another to calculate the effects of other income (second job, spouse's job).

  5. List of Mersenne primes and perfect numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_Mersenne_primes...

    Perfect numbers are natural numbers that equal the sum of their positive proper divisors, which are divisors excluding the number itself. So, 6 is a perfect number because the proper divisors of 6 are 1, 2, and 3, and 1 + 2 + 3 = 6. [2] [4]

  6. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    A form of unary notation called Church encoding is used to represent numbers within lambda calculus. Some email spam filters tag messages with a number of asterisks in an e-mail header such as X-Spam-Bar or X-SPAM-LEVEL. The larger the number, the more likely the email is considered spam. 10: Bijective base-10: To avoid zero: 26: Bijective base-26

  7. List of types of numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_numbers

    Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number. Constructible number: A number representing a length that can be constructed using a compass and straightedge. Constructible numbers form a subfield of the field of algebraic numbers, and include the quadratic surds.

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