Question

journal activity
kimora.r.h date: 10/1/25 hrc. 5
1.) 43×52
2.) 15×91
3.) 37×38

Explanation:

Step1: Calculate 43×52

$43\times52=(40 + 3)\times52=40\times52+3\times52=40\times(50 + 2)+3\times(50 + 2)=40\times50+40\times2+3\times50+3\times2=2000+80 + 150+6=2236$

Step2: Calculate 15×91

$15\times91=(10+5)\times91=10\times91+5\times91=10\times(90 + 1)+5\times(90 + 1)=10\times90+10\times1+5\times90+5\times1=900+10+450+5=1365$

Step3: Calculate 37×38

$37\times38=(40 - 3)\times38=40\times38-3\times38=40\times(40 - 2)-3\times(40 - 2)=40\times40-40\times2-3\times40 + 3\times2=1600-80-120 + 6=1406$

Answer:

$43\times52 = 2236$, $15\times91=1365$, $37\times38 = 1406$