Page 24 - Math_Genius_V1.0_C7_Flipbook

D:\Surender Prajapati\CBSE_ICSE_Book_New\CBSE\Grade-7\Math_Genius-7\Open_File\01_Chapter\01_Chapter
\ 15-Nov-2024 Surender Prajapati Proof-6 Reader’s Sign _______________________ Date __________

Practice Time 1D

Simplify the following expressions.

1. 12 − (16 − 8 ÷ 2) 2. (–4) − (–12) ÷ (–6) + (–4) × 5
3. 14 ÷ (3 of 2 − 3 + 4) − 9(5 − 3) 4. 32 − {10 + 12 − (14 + 3 − 1 + 2)}
5. 36 − [20 − {12 − (14 − 2 ÷ 2) × 1}] 6. (–5) × [6 + (–7) + 8] − [6 × {–8 + 7 + (–6)}]

7. 17 – [17 – {17 – (17 − 16 – 17)}] 8. 36 – {15 + 14 – (13 + 2 – 1 + 3)}]

maths fun
Complete the number grids by following the direction of arrows.
+ + + × –
10
5 (–3) 8 (–4) 1
× 20 + (–45) – 6 + 3
+ × + –
13 3 2 9
+ (–6) – 10 + 4 + 9
– + –
1 4 9
× (–1) + 15 × 12
× × – ×
2 3 6 3
+ 7 + 9 + (–4) + 9
– × +
32 10 4
× 2 + (–3) – 9
× × × +
3 (–8) 100 –21

www
MAths connect

An atom consists of charged particles called electrons and protons. Each proton has a charge of +1 and
each electron has a charge of –1. Remember the number of electrons is equal to the number of protons,
while answering these questions:
(a) What is the charge of an atom?

(b) What will be the charge of an atom if it loses four electrons?

(c) What will be the charge of an atom if it gains eight electrons?

Mental Maths

Solve the following riddle.
1. Minus of minus six
Minus minus-minus-seven
What do you get if this is added to minus-minus-seven again?
2. Add the value in riddle 1 to minus four and then minus two you take away
Divide this by minus two
What is the value can you say?

Mathematics-7 22