ffirs.indd

Multiplication Using Two Reference Numbers 91
the circles above. How much above? Two and 4, so we write 2 and
4 in the circles.
+2
+4
(10 × 12) 12 × 124 =
Now we multiply the number above the 12 (2) by the multiplication
factor, 12.
2 × 12 = 24
Draw another circle above the 12 and write 24 in it.
+24
+2
+4
(10 × 12) 12 × 124 =
Now we add crossways.
124 + 24 = 148
Write 148 after the equals sign and multiply it by our main reference
number, 10.
148 × 10 = 1,480
+24
+2
+4
(10 × 12) 12 × 124 = 1,480
Now multiply the numbers in the original circles, 2 × 4, and add
the answer to the subtotal.
2 × 4 = 8
1,480 + 8 = 1,488 Answer