Question 16
Observe: 11×11=121; 111×111=12321; 1111×1111=1234321. Fill all four blanks:
(a) 11111×□=123454321
(b) 111111×111111=□
(c) □×1111111=1234567654321
(d) 11111111×11111111=□. Enter the four whole numbers in order, separated by commas, without digit-grouping spaces.
(a) 11111×□=123454321
(b) 111111×111111=□
(c) □×1111111=1234567654321
(d) 11111111×11111111=□. Enter the four whole numbers in order, separated by commas, without digit-grouping spaces.