Advertisements
Advertisements
प्रश्न
Circle the correct subtraction fact (by using casting out nine).
2362 – 632 = 1720
उत्तर १
2362 – 632 = 1720
2362 – 632 = 1720
2 – 5 = 10
2 = 10 + 5
2 = 1 + 5
2 = 5
2 = 2
उत्तर २
Step 1: Calculate the digit sums (casting out nines)
Add the digits:
For 2362: 2 + 3 + 6 + 2 = 13 and 1 + 3 = 4 (digit sum)
For 632: 6 + 3 + 2 = 11 and 1 + 1 = 2 (digit sum)
For 1720: 1 + 7 + 2 + 0 = 10 and 1 + 0 = 1 (digit sum)
Step 2: Subtract the digit sums
4 − 2 = 2
Step 3: Compare with the digit sum of 1720
The digit sum of 1720 is 1, which does not match the expected digit sum (2).
he subtraction fact 2362 − 632 = 1720 is incorrect based on casting out nines.
APPEARS IN
संबंधित प्रश्न
Circle the multiples of 9 (by using casting out nine).
9443
Circle the correct addition fact (by using casting out nine).
2436 + 5315 = 7701
A9, B18, C27, D36, _______, ________, _________.
Complete the following sequence.
125, 150, 175, ______, ______, _______.
The school bell rings once in an hour, to indicate that the session ends/next session begins. And for break, it will be 20 minutes. Shall we try to fill this up?
Here is the time table.
| Period 1 | Period 2 | Break | Period 3 | Period 4 | Break | Period 5 | Period 6 |
| 9:00 | 10:00 | 11:00 | 2:40 |
Look at the calendar below.
Let us mark 3 × 3 boxes (9 dates) on the calendar and see some magic.
| Take the smallest number | 3 |
| Add 8 to it | +8 |
| = | 11 |
| Multiply it by 9 | ×9 |
| Total | 99 |
Now you choose any 3 × 3 boxes from a calendar and find the total in the same way.
Take any number. Now multiply it by 2, 3, 4 ............... at every step. Also, add 3 to it at each step. Look at the difference in the answer. Is it the same at every step?
Look at the numbers below. Look for the pattern. Can you take it forward?
What if someone gives you to add ten numbers together?
Did you notice some pattern in the answers?
Take the first two odd numbers. Now add them, see what you get. Now, at every step, add the next odd number.|
How far can you go on?
