ADDITION - ADDING ONE TO FIVE OR MORE DIGIT NUMBERS, WORD PROBLEMS, EXAMPLES, EXERCISES

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Please study about the
base-10 number system
or Decimal Number System,
if you have not already done so.

There, we have seen successor
numbers to a given number.

Successor number is nothing but
the number obtained
by adding 1 to the given number.

We have seen the base symbols
or characters or digits of the
decimal system as
0, 1, 2, 3, 4, 5, 6, 7, 8, 9.

You need to remember these digits
in order and their names.

In these digits, each digit is
1 added to the previous digit.

The symbol for adding is +.
So, we can say,
0 + 1 = 1; 1 + 1 = 2; 2 + 1 = 3;
3 + 1 = 4; 4 + 1 = 5; 5 + 1 = 6;
6 + 1 = 7; 7 + 1 = 8; 8 + 1 = 9.

Now suppose I ask you, what is 0 + 2 ?
or find the values of 1 + 2, 2 + 2,
3 + 2, 4 + 2, 5 + 2, 6 + 2, 7 +2.

Can you do that ?

In stead of adding 1,
we are adding two here.













To perform these additions,
you may use your fingers.
Close your fingers first.

Example 1 of Addition :

Find 1 + 2.

To add 2 to 1, open two fingers
from your closed fingers.

Start counting after 1
(to which we are adding),
and close one of your opened
fingers for every count.

so, you say two and close one
of the opened fingers.
Say three and close the remaining finger.

Now all fingers are closed.
The last said number, three,
is the answer.

So 1 + 2 = 3.

Example 2 of Addition :

Similarly what is 5 + 2 ?

Open two fingers and start counting
after 5 (to which we are adding) and
close one of the fingers for each count.

Thus you will count six and close one finger
and then count seven and close the other finger.
Now all fingers are closed. The last said number,
seven, is the answer.

Thus 5 + 2 = 7.

Similarly the other answers are,
0 + 2 = 2; 2 + 2 = 4; 3 + 2 = 5;
4 + 2 = 6; 6 + 2 = 8; 7 + 2 = 9.

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Exercise 1A : single digit numbers' addition

  1. Find 2 + 4
  2. Find 3 + 6
  3. Find 7 + 0
  4. Find 4 + 5
  5. Find 3 + 4
  6. Find 0 + 9
  7. Find 8 + 1
  8. Find 6 + 2
  9. Find 1 + 7
  10. Find 5 + 3

For Answers see at the end of the page.

Example 3 of Addition :

Now I ask you how much added to 3 wiil give 7.
In other words, fill in the blank 3 + --- = 7.

Here also you have to close all your
fingers first. To solve this question,
you have to start counting after 3
(to which some thing is to be added)
by rising one finger for each count
till you get the count equal to seven
(the value present on the right hand
side of equal to symbol).

You start saying four and rise one finger.
Then say five and rise another finger.
Then say six and rise one more finger.
Then say seven and rise another finger.
This is the last step, since seven is reached.

Now, count the raised fingers which are 4.
So the answer in the blank is 4. Ans

Let us see one more example.

Example 4 of Addition :

Fill in the blank --- + 4 = 9

Whether the blank is first or second,
the procedure is same.

Here also you have to close all your fingers first.
To solve this question, you have to start counting
after 4 (to which some thing is to be added) by rising
one finger for each count till you get the count equal to
nine (the value present on the right hand side of equal
to symbol).

You start saying five and rise one finger.
Then say six and rise another finger.
Then say seven and rise one more finger.
Then say eight and rise another finger.
Then say nine and rise another finger.
This is the last step, since nine is reached.

Now, count the raised fingers which are 5.
So the answer in the blank is 5.

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Exercise 1B : single digit numbers' addition

Fill in the Blanks.

  1. --- + 6 = 9
  2. 3 + --- = 6
  3. 5 + --- = 8
  4. --- + 9 = 9
  5. 4 + --- = 8
  6. --- + 4 = 6
  7. --- + 3 = 4
  8. 6 + ---- = 9
  9. --- + 1 = 3
  10. 3 + --- = 5

For Answers see at the end of the page.

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Further Topics on Addition

The following Links take you to
different topics of Addition.

Addition of

Two Digit Numbers.

Three Digit Numbers.

Four Digit Numbers.

Any Digit Numbers.

Addition Word problems.

Fractions.

Decimals.

Lesson Plans.

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Answers to Exercises

Answers to Exercise 1A :

  1. 6
  2. 9
  3. 7
  4. 9
  5. 7
  6. 9
  7. 9
  8. 8
  9. 8
  10. 8


Answers to Exercise 1B

  1. 3
  2. 3
  3. 3
  4. 0
  5. 4
  6. 2
  7. 1
  8. 3
  9. 2
  10. 2