Level 1, Lesson 27: Multiply Numbers Near 50

Cross-add to the base of 50, multiply that by 50, then adjust with the product of the two differences.

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Q148 × 53

Q247 × 52

Q349 × 54

Q446 × 53

Q548 × 52

Q651 × 53

Q747 × 54

Q849 × 51