( 2 tens 1 one ) x 10 standard form
Its 21 x 1 x 10 because 2 tens is 10+10 and that equals 20 and 1 stays the same x 10
Tens means groups the units into groups of 10. Therefore:
(2 tens 1 one ) x 10 standard form is:
(20 + 1) x 10 = 21 x 10 = 210
