Question 196872
3004 can be rounded to 3000 and 5982 rounded to 6000 (both are rounded to the nearest thousand)



So we can then multiply 3000 and 6000 mentally to get 18,000,000 (3*6 = 18 and just add 2 sets of 3 zeros)



So 3004 x 5982 estimates to 18,000,000