Answer:
924
Shaded squares
Step-by-step explanation:
So we know that the pattern adds 4 new shaded squares every time, if we do that up to 21 you’ll get 84 for the last shaded square (21*4)
Now we want to know everything added up so we have to add 4,8,12,16,20...84
Theres a easier way then adding them 1 by 1
So we know the last number plus the first number is 88 (84+4), now this patter also repeats for the 2nd number and the 2nd to last number (80), so that is 8+80 which is also 88. Now we half the 21 which is 10.5, you then multiply 10.5*88 which is 924. You can use this method for any question but instead with different numbers.
