Advertisements
Advertisements
Question
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?

Advertisements
Solution

Difference between 39 − 27 = 12
Difference between 51 − 39 = 12
Difference between 63 − 51 = 12
Difference between 75 − 63 = 12
Difference between 87 − 75 = 12
Difference between 99 − 87 = 12
Thus, the difference is same at all the steps.
APPEARS IN
RELATED QUESTIONS
Circle the correct addition fact (by using casting out nine).
7632 + 2213 = 9845
Circle the correct subtraction fact (by using casting out nine).
7420 − 3625 = 3795
Circle the correct addition fact (by using casting out nine).
4355 + 5369 = 9724
Circle the correct multiplication fact (by using method of casting out nine).
312 × 36 = 11232
90, 180, 270, _______, ________, ________.
A9, B18, C27, D36, _______, ________, _________.
Imagine you are a traffic inspector. You are asked to design the traffic signal timings. Can you design it?
| Red | Yellow/Orange | Green | Red | Green |
| 7:30 a.m |
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.
Ask your friend rite — W down your A age. dd 5 to it. Multiply the sum by 2. Subtract 10 from it. Next, divide it by 2. What do you get?
Number Surprises

