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Addition and subtraction strategies
Our main objectives are :
Describe and apply mental mathematics strategies for adding two 2-digit numerals, such as:
Describe and apply mental mathematics strategies for adding two 2-digit numerals, such as:
- adding from left to right
- taking one addend to the nearest multiple of ten and then compensating
- using doubles.
- taking the subtrahend to the nearest multiple of ten and then compensating
- thinking of addition
- using doubles.
- using doubles
- making 10
- using the commutative property
- using the property of zero
- thinking addition for subtraction in order to understand and recall basic addition facts and related subtraction facts to 18.
Place Value and 3- digit numbers
Websites to practice what we learned:
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Our main objectives are :
1. Represent and describe numbers to 1000, concretely, pictorially and symbolically. 2. Compare and order numbers up to 1000. 3. Illustrate concretely, and pictorially, the meaning of place value, for numerals to 1000. We are working hard to accomplish these goals and more : Read a given three-digit numeral without using the word and; e.g., 321 is three hundred twenty-one, NOT three hundred AND twenty-one. Read a given number word (0 to 1000). Represent a given number as an expression; e.g., 300 - 44 or 20 + 236 for 256. Represent a given number, using manipulative such as base ten materials. Represent a given number pictorially. Write number words for given multiples of ten to 90. Write number words for given multiples of a hundred to 900. Place a given set of numbers in ascending or descending order, and verify the result by using a hundred chart (e.g., a one hundred chart, a two hundred chart, a three hundred chart), a number line or by making references to place value. Create as many different 3-digit numerals as possible, given three different digits. Place the numbers in ascending or descending order. Identify and explain errors in a given ordered sequence. Identify missing numbers in parts of a given hundred chart. Identify errors in a given hundred chart. |