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  2. Base ten blocks - Wikipedia

    en.wikipedia.org/wiki/Base_ten_blocks

    Dienes blocks in use. Base ten blocks, also known as Dienes blocks after popularizer Zoltán Dienes (Hungarian: [ˈdijɛnɛʃ]), are a mathematical manipulative used by students to practice counting and elementary arithmetic and develop number sense in the context of the decimal place-value system as a more concrete and direct representation than written Hindu–Arabic numerals.

  3. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    A subtraction problem such as is solved by borrowing a 10 from the tens place to add to the ones place in order to facilitate the subtraction. Subtracting 9 from 6 involves borrowing a 10 from the tens place, making the problem into +. This is indicated by crossing out the 8, writing a 7 above it, and writing a 1 above the 6.

  4. Base ten block - Wikipedia

    en.wikipedia.org/wiki/Dienes_blocks

    Base ten block. Base ten blocks, also known as Dienes blocks after popularizer Zoltán Pál Dienes, are a mathematical manipulative used by students to learn basic mathematical concepts including addition, subtraction, number sense, place value and counting. The student can manipulate the blocks in different ways to express numbers and patterns.

  5. Lattice multiplication - Wikipedia

    en.wikipedia.org/wiki/Lattice_multiplication

    If the sum contains more than one digit, the value of the tens place is carried into the next diagonal (see Step 2). Step 2. Numbers are filled to the left and to the bottom of the grid, and the answer is the numbers read off down (on the left) and across (on the bottom). In the example shown, the result of the multiplication of 58 with 213 is ...

  6. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    The square of mn, mn being a two-digit integer, can be calculated as. 10 × m (mn + n) + n2. Meaning the square of mn can be found by adding n to mn, multiplied by m, adding 0 to the end and finally adding the square of n. For example, 23 2: 23 2. = 10 × 2 (23 + 3) + 3 2.

  7. Counting rods - Wikipedia

    en.wikipedia.org/wiki/Counting_rods

    The value of a number depends on its physical position on the counting board. A 9 at the rightmost position on the board stands for 9. Moving the batch of rods representing 9 to the left one position (i.e., to the tens place) gives 9[] or 90. Shifting left again to the third position (to the hundreds place) gives 9[][] or 900.

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