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Question
Number Surprises
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Solution
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RELATED QUESTIONS
Circle the multiples of 9 (by using casting out nine).
24689
Circle the correct subtraction fact (by using casting out nine).
7420 − 3625 = 3795
Circle the correct subtraction fact (by using casting out nine).
6732 – 4361 = 2371
Circle the correct multiplication fact (by using method of casting out nine).
723 × 24 = 17508
Complete the following sequence.
9 × 6 = 54
9 × 66 = 594
9 × 666 = 5994
9 × 6666 = 5 ______ 4
9 × 666666 = _____________
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 |
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.
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?
Now try doing it with some other number and also take a different number to add at each step.
