Mental Math Class 5 Worksheet – Dodging Tables and Simplification
Mental Math Class 5 Worksheet Chapter Number. Here in this page we have given total 25 Questions Set with Solution for Students.
(Q1) Simplify
48×4×5×0+8
Solution:
We know, Any number multiply with ‘0’ we get value ‘0’.
∴ 48×4×5×0 = 0 and remains + 8
∴ Answer 48×4×5×0+8 = 8
(Q2) 12×3+6÷3
Solution:
Here, we have to apply ‘BODMAS’ Rule.
1st we done division, then multiplication & then —-
6÷3 = 2, 12×3 = 3
∴ (12×3) + (6÷3)
36 + 2 = 38
(Q3) 25÷5×4+20-10
Solution:
By BODMAS Rule, we 1st done division then multiplication then addition and subtraction.
25÷5 = 5
5×4+20 – 10
20 + 20 – 10
40 – 10 = 30
(Q4) 250 – (20×3-50)
Solution:
1st we solve bracket and in bracket we done 1st multiplication and then subtraction.
(20×3-50)
60 – 50 = 10
∴ 250 – 10
= 240
250 – (20×3 – 50) = 240
(Q5) (1500÷150) × 10
Solution:
We 1st solve bracket
1500 ÷ 150 = 10
∴ 10×10 = 10
∴ (1500÷150) × 10 = 100
(Q6) 48 + 20 ÷ 10 × 5
Solution:
We 1st done division then multiplication then addition.
48 + (20÷10) × 5
48 + (2×5) = 48 + 10
48 + 20 ÷ 10 × 5 = 58
(Q7) 84 ÷ 7 × 12 + 80
Solution:
We 1st done division, then multiplication and then addition.
(84÷7) × 12 + 80
(12 × 12) + 80
140 + 80 = 222
∴ 84÷7×12+80 = 222
(Q8) 24 × 2 + 8 ÷ 2 – 20
Solution:
We apply “BODMAS” Rule
(24×2) + (8÷2) – 20
48 + 4 – 20
52 – 20
= 32
∴ 24×2+8÷2 – 20 = 32
(Q9) 30÷6×5+25
Solution:
We 1st done division then multiplication and then addition.
(30÷6) × 5 + 25
(5 × 5) + 25
25 + 25
= 50
∴ 30 ÷ 6 × 5 + 25 = 50
(Q10) 50×5 ÷ 250×0
Solution:
We know, any number multiply with ‘0’ the answer is always ‘0’
50×5÷250×0 = 0
(Q11) Find ‘x’
12 × x = 96
Solution:
∴ 12x = 96
x = 96/12
x = 8
(Q12) (90÷10) × x = 180, find x?
Solution:
We 1st solve bracket
(90÷10) = 9
9×x = 18
x = 180/9
x = 20
(Q13) (20×5) + 10 = 11 × 5 × x, find x?
Solution:
We 1st solve bracket
(20×5) = 100
100 + 10 = 55×x
110 = 55×x
x = 110/55
x = 2
(Q14) x × 40 = 8000
Solution:
40x = 8000
x = 8000/40
x = 200
(Q15) Find 1010 ÷ 9
Solution:
We have to divide 1010 by 9
The answer is 112.222 or 112.2
(Q16) How many times will you add 25 to get number 1000?
Solution:
Let, we add 25 ‘x’ times to get ‘1000’
∴ 25 × ‘x’ = 1000
We have to find x
∴ x = 1000/25
x = 40
∴ 25 we have to add 40 times to get 1000.
(Q17) If 150×5 = 750 then find 150×8 =?
Solution:
∴ Given that, 150×5 = 750, we have to find 150×8 =?
We write 8 = (5 + 3)
150 × (5+3) = 150×5 + (150×3)
= 750 + 450
150 × 8 = 1200
(Q18) If 40 × 12 = 480 then find 40×8 =?
Solution:
Given that, 40×12 = 480, we have to find 40×8=?
We write 8 = (12 – 4)
∴ 40×8 = 40 × (12 – 4)
= (40 × 12) – (40 × 4)
= 480 – 160
40 × 8 = 320
(Q19) x × 250 = 10,000 find x?
Solution:
Here, 250 x = 10,000
x = 10,000/250
x = 40
(Q20) (25×25) × x = 62500, find x?
Solution:
We 1st solve bracket
(25×25) = 625
625×x = 62500
x = 62500/625
x = 100
(Q21) Find value of x by simplification.
20 × 43 = (20 × 40) + (20 × x)
Solution:
We can write,
43 as (43 + 3)
20 × 43 = 20 × (40 + 3)
= (20 × 40) + (20×3)
∴ The value of x is 3
(Q22) 90×12 = (90×15) – (90×x) find ‘x’?
Solution:
We can write,
12 as = (15 – 3)
90 × 12 = 90 × (15 – 3)
90 × 12 = (90 × 15) – (90 × 3)
∴ From this we get value of x is ‘3’.
(Q23) If 25 × 10 = 250 then find 25 × 6 =?
Solution:
Given that, 25 × 10 = 250, we have to find 25 × 6 =?
We write 6 as (10 – 4)
∴ 25 × 6 = 25 × (10 – 4)
25 × 6 = (25 × 10) – (25 × 4)
25 × 6 = 250 – 100
25 × 6 = 150
(Q24) Find 4 times of 12.5?
Solution:
Here, we have to find,
4 times of 12.5
∴ We have to multiply 4 to 12.5
4 × 12.5
We eliminate decimal
4×12.5 = 50
(Q25) Find 14 + 14 + 14 + 14 = x find x?
Solution:
∴ Here we have to add 14 by 4 times
We directly multiply 14 by 4 to get ‘x’.
14×4 = x
56 = x
∴ The value of x is 56.