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Mental Maths

1. What would be the quotient if 725 – 527 is divided by 99?
2. Without performing actual division, find the remainder when 428 + 284 + 842 is divided by 111.
3. If AB × 4 = 96, then what is the value of A + B?
4. Find the value of A in the given multiplication: A A A
× A
4 4 4
5. In a certain code language, MATHS is written as 13 1 20 8 19. In the same code language, how will SCIENCE
be written?
6. If N ÷ 5 leaves remainder 3 and N ÷ 2 leaves remainder 0, then what does N ÷ 10 leave the remainder?
7. Complete the given magic square:
6 –1
1
2

Brain Sizzlers

1. Fill in the numbers from 1 to 9 without repetition, so that each side of the triangle adds up to 18.

2. A 3-digit number 1AA, is added to the number 715 to give a 3-digit number 8B7, which is divisible by 93. Find
the value of A + B.

create and solve
Create a ladder using numbers (0–9) and appropriate operations. Consider the number obtained
at the end as the target number. Now, make a similar ladder which is empty and ask your friend/classmate to
complete it using the clues.
For example,

Numbers allowed: 1 5 2 6 4 How will you complete it if your friend challenges you?
Numbers allowed: 2 3 6 7 9

5 + 2 = 7 7
– +
1
=
6 × 4 = 24
÷
6
=
4 3

353 Playing With Numbers