Bob is 1 unit (1050 cards). Brett has twice as many, so 2 units. Together they are 3 units.

Bob1050Brett10501050total = ?

Plain numbers are given; italic underlined numbers are worked out.

  1. Brett = 2 units → 2 × 1050 = 2100
  2. Together = 1050 + 2100 = 3150

Together the two boys have 3150 cards.

Check: 1050 + 2100 = 3150. ✓