Let’s solve each problem step by step.
We are finding the
LCM (Least Common Multiple) of two numbers.
The worksheet gives us a helpful hint:
> “When one number is a multiple of the other, then their LCM = greater number.”
That means if the bigger number can be divided evenly by the smaller number, then the LCM is just the bigger number.
Let’s check each pair:
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a) 3 and 24
Is 24 divisible by 3? → 24 ÷ 3 = 8 → Yes!
So LCM = 24
b) 5 and 25
25 ÷ 5 = 5 → Yes!
LCM = 25
c) 15 and 60
60 ÷ 15 = 4 → Yes!
LCM = 60
d) 16 and 48
48 ÷ 16 = 3 → Yes!
LCM = 48
e) 7 and 42
42 ÷ 7 = 6 → Yes!
LCM = 42
f) 18 and 36
36 ÷ 18 = 2 → Yes!
LCM = 36
g) 36 and 72
72 ÷ 36 = 2 → Yes!
LCM = 72
h) 9 and 81
81 ÷ 9 = 9 → Yes!
LCM = 81
i) 20 and 40
40 ÷ 20 = 2 → Yes!
LCM = 40
j) 25 and 50
50 ÷ 25 = 2 → Yes!
LCM = 50
k) 8 and 72
72 ÷ 8 = 9 → Yes!
LCM = 72
l) 19 and 95
95 ÷ 19 = 5 → Yes! (because 19 × 5 = 95)
LCM = 95
m) 16 and 64
64 ÷ 16 = 4 → Yes!
LCM = 64
n) 45 and 90
90 ÷ 45 = 2 → Yes!
LCM = 90
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All pairs follow the rule: the larger number is a multiple of the smaller one, so LCM = larger number.
Final Answer:
a) 24
b) 25
c) 60
d) 48
e) 42
f) 36
g) 72
h) 81
i) 40
j) 50
k) 72
l) 95
m) 64
n) 90
Parent Tip: Review the logic above to help your child master the concept of factors and multiples worksheet grade 4.
