a b c , d e f
Each letter represents a place value.
a = hundred thousands
b = ten thousands
c = thousands
d = hundreds
e = tens
f = ones
a number that has a double the number of tens as ones.
a b c, d ΔΔ Δ
and three times a number of thousands as hundreds
a b ∞∞∞ , ∞ ΔΔ Δ
The number would be: 3,121