Mary spent less than $130. She already bought a toy helicopter at $24.10. 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 Mary left to spend on the 2 items
= 130 - 24.10
= $105.90
Round off each number to the nearest tens for a more accurate estimation.
(a) Aeroplane: $45.50 ≈ $50
(b) Blocks: $30.10 ≈ $30
(c) Teddy bear: $40.40 ≈ $40
(d) Lego: $71.80 ≈ $70
30 + 70 = 90
90 is nearest to 105.90.
Total amount spent on the two items
= 30.10 + 71.80
= $101.90
To use up all her money to buy another 2 items, she cannot exceed $105.90.
The total amount of $101.90 is nearest to and less than $105.90.
So, Mary bought (b) Blocks and (d) Lego.
Answer(s): (a) b, d; (b) $101.90