3. How will you compute Astrid’s daily earnings? To
solve her daily earnings you have to multiply 75 by 42.
How do you multiply by a 2-digit multiplier?
Steps in multiplying 2-digit multiplier
1) Multiply starting from the ones digit of the
multiplier, 2 x 5 = 10.
2) Write 0 in the ones place; regroup 1 in the
tens place.
75
x 42
0
1
4. 75
x 42
0
1
Steps in multiplying 2-digit multiplier
3) Multiply the tens place by 2, then add 1. 7 x
2 = 14 + 1 = 15
4) Partial product: 150
5) Then, multiply the ones digit of the
multiplicand by the tens digit of the
multiplier, 4 x 5 = 20.
6) Write the 0 in the tens place; regroup 2 in
the tens place.
15
75
x 42
1
150
0
2
5. 7) Multiply the tens place of the multiplicand by 4,
then add 2.
7 x 4 = 28 + 2 = 30
8) Partial product: 300
9) Finally, add the partial products.
75
x 42
1
150
0
2
30+
Answer: Astrid’s daily earnings is
$3,150.00
$3,150.00
6. Another examples:
a) Multiply using the ones digit of the multiplier
54 x 2 = 108.
b) Multiply using the tens digit of the multiplier
54 x 1 = 54.
c) Add the partial products.
54
X 2
108
+ 54
648
Answer: 648
