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प्रश्न
Is this magic possible on a 10 × 10 number chart? Go to the Chapter ‘Fun with Numbers’ and check.
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उत्तर
check with a 10 × 10 number chart
Yes, the magic works in a 10 × 10 number chart also.
The cross lines- 1 + 12 + 23+ … + 89+ 100 = 505
and 10 + 19 + 28+ … + 82 + 91 = 505
As there is no middle line, we have to get average sum of both horizontal lines
5 + 15 + 25+ … + 95 and 6 + 16 + 26 + … 96 = 505
Average sum of both vertical lines
41 + 42 + 43 + … + 50 and 51 + 52 + 53 + … + 60 = 505.
Thus, the magic works here as well.
APPEARS IN
संबंधित प्रश्न
This is a story with topsy turvy time.
As the sun sets ______ Sumana wakes up. What a lovely evening! ______. She washes her face fast in 2 hours ______ and runs out. She goes straight to the bird’s nest. She has been watching the eggs for the last few months ______. She was waiting for the baby birds to come out. But before she can blink her eyes, in a week ______ a cat jumps on to the tree. The mother bird cries loudly and Sumana rushes to shoo away the cat. As the cat jumps, it hits the big green mango. Dhum!...
...In two days ______ it is on the ground! Oh, how sad! The mango is still not fully ripe. It needed one more year ______ to become sweet. Suddenly Sumana’s sister calls but - Are you still not hungry? Has your stomach clock gone to sleep? Come and eat hot upma for dinner ______.
Wasn’t that funny? You must have guessed that the coloured words are wrong. Choose the correct word from the box given below and write it next to the wrong word.
| Days | rises | seconds | morning |
| Breakfast | moment | minutes | week |
Think of many different things that can take different times. Make your table as long as you can.
| Takes minutes | Takes hours | Takes days |
| a bath | to stitch a shirt | to knit a sweater |
| to boil milk | to set curd | to weave a sari |
| a school day | for a banana to become ripe |
Look at the birth certificate of Bincy.
On what date will Bincy be eight years old? Write in numbers
Look at the birth certificate of Bincy.
How many months old was Bincy on 2 August 2002?
Look at the birth certificate of Bincy.
After how many months of Bincy's birth was the certificate issued?
Which festival comes at the end of the year?
Here is the calendar for the month of February 2019. Let us mark a square on the calendar and see some magic.
Which is the number in the centre of the square?
Add the three numbers on each of these lines. What do you notice?
5 + 13 + 21 =
6 + 13 + 20 =
7 + 13 + 19 =
12 + 13 + 14 =
Now look at the calendar of 2020. Also look for the present month and draw any similar square in your notebook. Does the magic work for these?
Which months in the calendar (2020) have 5 Sundays?
