# Use mental and informal written strategies to multiply a two-digit number by a one-digit number, including: using known facts, multiplying the tens and the units, using an area model, using doubling and repeating, using the relationship between multiplica

 1 Double up and add: Double 40, +4, +10 2 Double up and add: Double 30, +8, +10 3 Double up and add: Double 35, +9, +10 4 Double up and add: Double 37, +4, +10 5 Double up and add: Double 22, +8, +10 6 Hit the big times: 12 x 2 7 Hit the big times: 14 x 2 8 Hit the big times: 11 x 5 9 Hit the big times: 13 x 2 10 Hit the big times: 12 x 4 11 Hit the big times: 12 x 3 12 Use the pattern: 3 x 15 = 3 x 10 + 3 x 5 13 Number detectives: 40 x 7 14 Use the pattern: 4 x 16 = 4 x 10 + 4 x 6 15 Use the pattern: 5 x 15 = 5 x 10 + 5 x 5 16 Use the pattern: 4 x 23 = 4 x 20 + 4 x 3 17 Use the pattern: 2 x 26 = 2 x 20 + 2 x 6 18 Use the pattern: 8x43 = 8x40 + 8x3 19 Use the pattern: 5 x 35 = 5 x 30 + 5 x 5 20 Use the pattern: 9x63 = 9x60 + 9x3 21 Use the pattern: 6x84 = 6x80 + 6x4 22 Use the pattern: 4x73 = 4x70 + 4x3 23 Use the pattern: 5x44 = 5x40 + 5x4 24 Use the pattern: 8x62 = 8x60 + 8x2 25 Use the pattern: 3x64 = 3x60 + 3x4 26 Use the pattern: 7x56 = 7x50 + 7x6 27 Use the pattern: 6x78 = 6x70 + 6x8