Solve more difficult number problems mentally

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Presentation transcript:

Solve more difficult number problems mentally

16 48 56 32 24 40 Find the number: -a 2-digit number a multiple of 8 the product of its digits is 30 16 48 56 32 24 40

42 35 Find the number: -between 30 and 50 a multiple of 7 the sum of its digits is 6 42 35

14 42 49 35 28 21 56 63 Find both numbers: 2-digit numbers multiples of 7 the sum of each number’s digits is 9 14 42 49 35 28 21 56 63

(__ + 7) x 6 = 60 3 60 ÷ 6 = 10 10 – 7 = 3

(__ x 9) + 8 = 62 6 62 - 8 = 56 56 ÷ 9 = 6

(__ ÷ 4) - 3 = 4 28 4 + 3 = 7 7 x 4 = 28