Sets and Addition Sentence

A set is a group of objects. We call the objects in each set as elements.

ADDITION SENTENCE

  1. An addition sentence has many parts. The number we add are called the addends. The answer is called the sum. The symbol "+" is called the plus sign. It means we add or put together. The symbols "=" is called the equal sign. We write the sum after this sign.
  2. There are two ways of writing an addition sentence. We have the horizontal and vertical ways of writing addition sentences
  3. When we add using the number line, we always start from 0.
  4. The Commutative or Order Property Addition means that changing position of places of the addend will not change the sum/
  5. The Associative  or Grouping Property of Addition means that changing the position or places of the addends will not change the sum
  6. The Zero Property of Addition means that any number added to zero is always equal to the same number.
  7. We can add two-digit numbers horizontally by writing their expanded form. This is called the long method  of adding numbers
  8. We can also add two-digit numbers vertically. To add two-digit numbers, we must put the ones digits in one column and the tens digit in another column. This is the short method  of adding numbers.
  9. There are easy steps we must follow to solve a word problem which are"
    1. What are the given numbers in the problem?
    2. What is asked in the problem?
    3. What shall we do? Write your plan
    4. What is the number sentence?
    5. Solve
    6. What is the answer? Label it.

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