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To find two numbers that multiply to 840, we can factorize 840 into its prime factors: 2 x 2 x 2 x 3 x 5 x 7. To pair these factors, we can combine them into pairs that equal 840, such as (2 x 420), (2 x 2 x 210), (2 x 2 x 2 x 105), (2 x 2 x 3 x 70), (2 x 2 x 5 x 42), (2 x 2 x 2 x 3 x 35), (2 x 2 x 3 x 5 x 14), (2 x 2 x 2 x 3 x 5 x 7). Therefore, the pairs of numbers that multiply to 840 are (2, 420), (4, 210), (8, 105), (6, 140), (10, 84), (12, 70), (14, 60), and (15, 56).
840 = 23 x 3 x 5 x 7