Question

a) Multiply 82 X 34 with math workings
b) multiply 69 x 12 with math working ​

Answer 1

Let's use the easiest breaking method to solve:

#a

• 82 = 80+2
• 34 = 30+4

Multiply each term of 82 by each broken term of 34, i.e.

$\tt \multimap \: 80 \times (30 + 4) + 2 \times (30 + 4)$

$\tt \nrightarrow \: 80 \times 34 + 2 \times 34$

$\tt \Rrightarrow \: 2720 + 68$

$\tt \rightharpoonup \: 2788$

#b

• 69 = 70-1
• 12 = 10+2

Multiply each term of 69 by each broken term of 12, i.e.

$\sf \multimap \: 70 \times (10 + 2) - 1(10 + 2)$

$\sf \nrightarrow \: 70 \times 12 - 1 \times 12$

$\sf \Rrightarrow \: 840 - 12$

$\sf \rightharpoondown \: 828$