Betty spent less than $90. She already bought a toy helicopter at $35.80. 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 Betty left to spend on the 2 items
= 90 - 35.80
= $54.20
Round off each number to the nearest tens for a more accurate estimation.
(a) Blocks: $27.10 ≈ $30
(b) Cube: $22.20 ≈ $20
(c) Aeroplane: $53.70 ≈ $50
(d) Doll: $43.40 ≈ $40
30 + 20 = 50
50 is nearest to 54.20.
Total amount spent on the two items
= 27.10 + 22.20
= $49.30
To use up all her money to buy another 2 items, she cannot exceed $54.20.
The total amount of $49.30 is nearest to and less than $54.20.
So, Betty bought (a) Cube and (b) Block.
Answer(s): (a) a, b; (b) $49.30