The document contains 10 math problems involving calculating sums, differences, products, and ratios of decimals. It asks the student to: 1) Calculate various additions, subtractions, multiplications, and divisions of decimals. 2) Find totals, differences, and products of decimal numbers. 3) Solve word problems involving heights of people, costs of items, amounts of ingredients, masses of objects, and number of truck loads needed.

1. UNIT 05 January
1. Calculate:
𝒂𝒂) 𝟏𝟏𝟑𝟑. 𝟖𝟖 + 𝟑𝟑. 𝟐𝟐𝟐𝟐
𝒃𝒃) 𝟔𝟔. 𝟏𝟏𝟏𝟏 + 𝟎𝟎. 𝟖𝟖𝟖𝟖 + 𝟏𝟏. 𝟑𝟑𝟑𝟑𝟑𝟑
𝒄𝒄) 𝟏𝟏𝟐𝟐𝟐𝟐. 𝟕𝟕𝟕𝟕 + 𝟖𝟖𝟖𝟖. 𝟐𝟐𝟐𝟐𝟐𝟐 + 𝟓𝟓. 𝟑𝟑𝟑𝟑𝟑𝟑𝟑𝟑
𝒅𝒅) 𝟏𝟏𝟑𝟑𝟑𝟑 − 𝟐𝟐𝟐𝟐. 𝟓𝟓𝟓𝟓
𝒆𝒆) 𝟏𝟏𝟐𝟐. 𝟖𝟖 − 𝟏𝟏. 𝟗𝟗𝟗𝟗𝟗𝟗
𝒇𝒇) 𝟔𝟔𝟔𝟔. 𝟓𝟓𝟓𝟓𝟓𝟓 − 𝟕𝟕. 𝟖𝟖𝟖𝟖
𝒈𝒈) 𝟏𝟏𝟕𝟕𝟕𝟕. 𝟒𝟒 − 𝟖𝟖𝟖𝟖. 𝟗𝟗𝟗𝟗𝟗𝟗𝟗𝟗
2. Add three decimals:
𝒂𝒂) 𝟑𝟑. 𝟐𝟐𝟐𝟐 − 𝟒𝟒 − 𝟒𝟒. 𝟕𝟕𝟕𝟕 − 𝟓𝟓. 𝟓𝟓 − ⋯
𝒃𝒃) 𝟖𝟖. 𝟔𝟔𝟔𝟔 − 𝟖𝟖. 𝟓𝟓 − 𝟖𝟖. 𝟑𝟑𝟑𝟑 − 𝟖𝟖. 𝟐𝟐 − ⋯
𝒄𝒄) 𝟏𝟏. 𝟓𝟓 − 𝟏𝟏. 𝟔𝟔𝟔𝟔 − 𝟏𝟏. 𝟕𝟕𝟕𝟕 − 𝟏𝟏. 𝟖𝟖𝟖𝟖 − ⋯
3. Solve:
𝒂𝒂) 𝟏𝟏𝟕𝟕. 𝟐𝟐𝟐𝟐 − 𝟏𝟏𝟏𝟏. 𝟓𝟓𝟓𝟓 − 𝟒𝟒. 𝟔𝟔𝟔𝟔𝟔𝟔
𝒃𝒃) 𝟏𝟏𝟕𝟕. 𝟐𝟐𝟐𝟐 − (𝟏𝟏𝟏𝟏. 𝟓𝟓𝟓𝟓 − 𝟒𝟒. 𝟔𝟔𝟔𝟔𝟔𝟔)
Axel Cotón Gutiérrez Mathematics 1º ESO Exercises – 1.5.1.1

2. UNIT 05 January
𝒄𝒄) 𝟏𝟏𝟐𝟐. 𝟒𝟒 − 𝟏𝟏𝟏𝟏. 𝟑𝟑𝟑𝟑𝟑𝟑 + 𝟕𝟕. 𝟔𝟔𝟔𝟔
𝒅𝒅) 𝟏𝟏𝟐𝟐. 𝟒𝟒 − (𝟏𝟏𝟏𝟏. 𝟑𝟑𝟑𝟑𝟑𝟑 + 𝟕𝟕. 𝟔𝟔𝟔𝟔)
4. Solve:
𝒂𝒂) 𝟑𝟑. 𝟐𝟐𝟐𝟐 ∙ 𝟏𝟏𝟏𝟏
𝒃𝒃) 𝟐𝟐. 𝟔𝟔 ∙ 𝟓𝟓. 𝟖𝟖
𝒄𝒄) 𝟐𝟐𝟕𝟕. 𝟓𝟓 ∙ 𝟏𝟏𝟏𝟏. 𝟒𝟒
𝒅𝒅) 𝟑𝟑. 𝟕𝟕 ∙ 𝟏𝟏. 𝟐𝟐𝟎𝟎
𝒆𝒆) 𝟒𝟒. 𝟎𝟎𝟎𝟎 ∙ 𝟐𝟐. 𝟕𝟕
𝒇𝒇) 𝟓𝟓. 𝟏𝟏𝟏𝟏 ∙ 𝟎𝟎. 𝟎𝟎𝟎𝟎
5. Calculate:
𝒂𝒂) 𝟖𝟖. 𝟑𝟑 + 𝟎𝟎. 𝟓𝟓 ∙ (𝟑𝟑 − 𝟒𝟒. 𝟐𝟐)
𝒃𝒃) 𝟑𝟑. 𝟓𝟓 − 𝟎𝟎. 𝟐𝟐 ∙ (𝟐𝟐. 𝟔𝟔 − 𝟏𝟏. 𝟖𝟖)
𝒄𝒄) (𝟓𝟓. 𝟐𝟐 − 𝟔𝟔. 𝟖𝟖) ∙ (𝟑𝟑. 𝟔𝟔 − 𝟒𝟒. 𝟏𝟏)
𝒅𝒅) (𝟏𝟏. 𝟓𝟓 − 𝟐𝟐. 𝟐𝟐𝟐𝟐) ∙ (𝟑𝟑. 𝟔𝟔 − 𝟐𝟐. 𝟖𝟖)
Axel Cotón Gutiérrez Mathematics 1º ESO Exercises – 1.5.1.2

3. UNIT 05 January
6. Roberto is 1.66 meters tall; Macarena is 0.38 m taller tha Roberto and Miguel is
0.23 m smaller tha Macarena. How tall is Miguel?
7. Olive oil costs 3.15 €/l. How much will a bottle of 0.75 l cost?
8. A kilo of watermelon costs 68 cents. How much costs a 3kg 750g watermelon?
9. In order to bake cakes for the school fair, I buy 180 kg of flour at $0.84 per kg
and 25 kg of sugar at $1.17 per kg. How much money have I spent?.
Axel Cotón Gutiérrez Mathematics 1º ESO Exercises – 1.5.1.3

4. UNIT 05 January
10. House bricks have a mass of 4.3 kg each and I buy 2500 of them to build a wall
around my courtyard.
a) Find the total mass of the bricks.
b) If my truck can carry only 2 tonnes at a time, how many truck loads are
necessary to transport the bricks?
Axel Cotón Gutiérrez Mathematics 1º ESO Exercises – 1.5.1.4