12 + 12 +12 + 12 + = 4 × ______, 4, 12, 40, 20, 45 × 100 = ________, 4500, 450, 100, 45, 39 × 4 = _______, 126, 139, 200, 156, 17 × 5 = 5 × _______, 5, 17, 175, 70, There are 15 boxes with 4 pencils in each box. How many pencils are there altogether?, 55, 70, 60, 58

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