Risa spent less than $100. She already bought a toy helicopter at $28.10. She tried to use up all her money and bought another two items.
- Name the two items. Give your answers in letters. (Eg a, b)
- What was the total cost for the two items?
(a)
Estimated amount that Madam Risa left to spend on the 2 items
= 100 - 28.10
= $71.90
Round off each number to the nearest tens for a more accurate estimation.
(a) Cube: $21.60 ≈ $20
(b) Guitar: $49.40 ≈ $50
(c) Cushion: $30.10 ≈ $30
(d) Ball: $37.60 ≈ $40
30 + 40 = 70
70 is nearest to 71.90.
Total amount spent on the two items
= 30.10 + 37.60
= $67.70
To use up all her money to buy another 2 items, she cannot exceed $71.90.
The total amount of $67.70 is nearest to and less than $71.90.
So, Risa bought (c) Cushion and (d) Ball.
Answer(s): (a) c, d; (b) $67.70