Use an expression to solve a real situation
Year 7 maths · Fieldbook Learning
Name ______________________ Date __________
The story gives a rule written with a letter. Put the number from the last sentence in place of the letter.
- A tree is 8 cm tall and grows 3 cm each year. After y years its height is 8 + 3y cm. How tall is it after 4 years?
- A tree is 19 cm tall and grows 3 cm each year. After y years its height is 19 + 3y cm. How tall is it after 1 years?
- A library has 5 books and buys 5 more each month. After m months it has 5 + 5m books. How many books does it have after 4 months?
- A library has 13 books and buys 2 more each month. After m months it has 13 + 2m books. How many books does it have after 4 months?
- A water bottle holds 42 mL and a runner drinks 7 mL each km. After d km the bottle holds 42 − 7d mL. How much is left after 4 km?
- A library has 17 books and buys 4 more each month. After m months it has 17 + 4m books. How many books does it have after 5 months?
- A library has 10 books and buys 6 more each month. After m months it has 10 + 6m books. How many books does it have after 5 months?
- A library has 24 books and buys 6 more each month. After m months it has 24 + 6m books. How many books does it have after 6 months?
- A library has 39 books and buys 4 more each month. After m months it has 39 + 4m books. How many books does it have after 8 months?
- A library has 42 books and buys 11 more each month. After m months it has 42 + 11m books. How many books does it have after 8 months?
- A tree is 45 cm tall and grows 7 cm each year. After y years its height is 45 + 7y cm. How tall is it after 3 years?
- A hiker is 47 km along a trail and walks 8 km each hour. After h hours the hiker is 47 + 8h km along. How far along is the hiker after 6 hours?
- A tree is 66 cm tall and grows 6 cm each year. After y years its height is 66 + 6y cm. How tall is it after 13 years?
- A hiker is 36 km along a trail and walks 7 km each hour. After h hours the hiker is 36 + 7h km along. How far along is the hiker after 14 hours?
- A library has 37 books and buys 10 more each month. After m months it has 37 + 10m books. How many books does it have after 10 months?
- A tree is 73 cm tall and grows 13 cm each year. After y years its height is 73 + 13y cm. How tall is it after 11 years?
- A tree is 119 cm tall and grows 19 cm each year. After y years its height is 119 + 19y cm. How tall is it after 10 years?
- A library has 61 books and buys 17 more each month. After m months it has 61 + 17m books. How many books does it have after 22 months?
- A tank has 41 L of water and a tap adds 13 L each minute. After t minutes it holds 41 + 13t L. How many L does it hold after 21 minutes?
- A water bottle holds 158 mL and a runner drinks 12 mL each km. After d km the bottle holds 158 − 12d mL. How much is left after 13 km?