Page 43 - Touchpad Mathematics_Ver1.0_C4

E:\Working\Orange_Education\TouchPad_Maths_4_(10-11-2025)\Open_Files\Chap_02\Chap_02
\ 12-Nov-2025 Bharat Arora Proof-8 Reader’s Sign _______________________ Date __________

HOTS
21 st
Century #Critical Thinking
1. Find the missing digits. Skills

a. b.
2 3 4 5 7 3 4 5
+ 5 4 3 + 1 9 6
0 0 6 9 2 6 9

c. 7 0 4 d. 7 3 4

– 9 7 8 – 1 3 2

5 0 0 5 4 3 9 3 6

2. Using all four of these number cards, form: 7 9 4 0

a. the greatest 4-digit number _____________
b. the smallest 4-digit number _____________

Now, find the difference of the two numbers formed.

Puzzle Century #Critical Learning
21 st
Skills
1. There are nine numbers 1-9 to be put on the three discs.

a. Abhay puts three numbers on each number disc as shown 1 2 4 5 7 8
here. Remove one number from one of the discs and place it 3 6 9
on another disc so that each of the three discs may have the same total.
b. Arti wants to arrange the numbers such that each of the

discs must have three numbers and the same total. Can
you help her?
+ 1 = – 22 =
2. Start with an operation, then use its result to solve
the next one, and continue until the entire puzzle – + – + –

is completed. – 3 = 1 + = 5

= = = = =

49 + = – 26 =

+ + – – +

4 + = 13 – = 0

= = = = =

– 13 = – =

41
Addition and Subtraction