Add three numbers to 100


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Adding and Subtracting Within 20 – Explained for Kids

What Does It Mean?

  • Adding means putting things together. If you have 2 apples and get 3 more, you add them to see how many you have in total.
  • Subtracting means taking away. If you have 5 candies and eat 2, you subtract to find out how many are left.

Real-Life Examples:

  1. Adding:
    • Birthday Balloons: Imagine you have 4 balloons and your friend gives you 5 more. Count them all together: 4 + 5 = 9 balloons.
    • Collecting Stickers: You have 6 stickers, and you find 7 more in a magazine. Now, count them all: 6 + 7 = 13 stickers.
  2. Subtracting:
    • Sharing Cookies: You have 10 cookies. You share 3 with your friend. How many are left? Take away 3 from 10: 10 – 3 = 7 cookies left.
    • Playing with Blocks: You build a tower with 15 blocks. 5 blocks fall off. How many are still in the tower? Subtract the fallen blocks: 15 – 5 = 10 blocks remain.

Tips for Learning:

  • Use your fingers to count when adding or subtracting small numbers.
  • Draw pictures or use toys for counting.
  • Remember, adding increases the number, and subtracting decreases it.

By practicing with these simple examples, you’ll get better at adding and subtracting numbers within 20 in no time!

Using Fingers for Addition and Subtraction

  1. Addition:
    • Start with your fingers down.
    • For each number you are adding, raise that many fingers.
    • For example, to add 3 + 4, first raise 3 fingers, then raise 4 more. Count all the raised fingers to get the answer (7).
  2. Subtraction:
    • Start with all fingers raised for the larger number.
    • For each number you are subtracting, put down that many fingers.
    • For instance, to subtract 5 from 8, start with 8 fingers up and then put 5 fingers down. Count the remaining raised fingers to find the answer (3).

Using a Number Line for Addition and Subtraction

  1. Addition:
    • Draw a straight line and mark numbers on it from 0 onwards.
    • Start at the first number in your addition.
    • Move forward on the line by the amount of the second number.
    • The number you stop at is your answer.
    • Example: 3 + 4, start at 3, move forward 4 spaces, and you land on 7.
  2. Subtraction:
    • Use the same number line.
    • Start at the larger number.
    • Move backwards by the amount of the smaller number.
    • The number you stop at is your answer.
    • Example: 8 – 5, start at 8, move back 5 spaces, and you land on 3.


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