6 Write the function of each machine. Input Output b a Input 3 4 ? 6 c Input 8 7 12 9 14 Output Q6a hint 2 ? 3+3=6 3×2=6 6 8 Output 14 16 6 7 ? 8 18 9 Expressions 1 Simplify a b1b b b1b1b c 4b 1 3b d 5b 1 b e 3b 1 b 1 2b 2 Simplify a b1b1b1b b 3b 1 2b c 5b 2 2b d 4b 2 3b e 7b 2 b f 6b 2 b 2 4b Q1a hint b 1 b b 1 b 1 b b b b b 1 b b b b b b b 1 b 1 b b b b 1 block + 1 block = u blocks b + b = ub b 1 b b Q2c hint b 1 b 1 b 1 b b b b 1 b b b b b b b b b b b b b b b b b b b b b 5 blocks − 2 blocks = u blocks 5b − 2b = ub b b Q2f hint b 1b is the same as b. 3 Simplify a 2y + 4y b 7v + 2v c 8m + 2m + m Q3a hint d 7p − 6p e 11n − 5n 1 4 Match the story to the calculation. A Joe has 3 sweets. He gets 2 more. B Penny has 3 texts. She deletes 1. C Suha has x sweets. She gets 3 more. D Kunal has x texts. He deletes 2. x−2 ii x + 3 iii 3 − 1 iv 3 + 2 i 5 a Ella has a bag containing 5 apples. She puts in 4 more. Write a calculation to show this. b Will has a bag containing x apples. He puts in 4 more. Write an expression to show this. 6 a Jamie has a box containing 9 pens. He takes out 5. Write down a calculation to show this. b Katya has a box containing y pens. She takes out 3. Write down an expression to show this. 7 Match the story to the calculation. A Joe has £8. Alice has twice as much. B Paula has 4 books. Hans has 5 times as many. C Sham has £x sweets. Sita has twice as many. D Erin has x books. Tao has 5 times as many. 77 x×2 ii x × 5 iii 8 × 2 iv 4 × 5 i