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Primary 4 Four Operations of Decimals study guide: the whole chapter, step by step

About this subtopic

This mixed practice stop brings together 1 topics from Primary 4 Four Operations of Decimals: Mixed practice. Nothing on the question says which topic it comes from, so choosing the method is part of the skill.

Practice questions with worked solutions

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Intermediate

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Question 1 of 10 · Basic · free to tryTwo bags of rice have a total mass of 18.45 kg. Bag A is 3.65 kg heavier…Two bags of rice have a total…

Two bags of rice have a total mass of 18.45 kg. Bag A is 3.65 kg heavier than Bag B. What is the mass of Bag A?

kg

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Working

  1. Mass of 2 equal units = 18.45 − 3.65 = 14.80 kg
  2. Mass of 1 unit = 14.80 ÷ 2 = 7.40 kg
  3. Mass of Bag A = 7.40 + 3.65 = 11.05 kg

Answer: 11.05 kg

For parents

How can P4 decimal operations mixed practice help my child choose the right steps?

Your child selects and combines decimal operations to answer a question in context.

What your child learns here

Your child selects and combines decimal operations to answer a question in context. This chapter's mixed stop applies addition, subtraction, multiplication and division within the P4 outcomes, including problems about related amounts. Understanding what each calculated value represents helps your child decide the next step and recognise when the requested answer has been found.

  • Distinguish a combined total, a difference, equal groups and an equal share, then choose the operation that matches the relationship being described.
  • Add and subtract decimals up to two places, preserving place value through column working and any necessary regrouping.
  • Multiply or divide a decimal by a one-digit whole number and connect the result with the count of items, groups or shares in the story.
  • Use a known total, comparison or repeated purchase to find an unknown amount, stating what each intermediate result measures.
  • Follow instructions about exact answers and rounding, then check that the final number has the right unit and answers the question asked.
Does the answer make sense?

In a spending problem with no other changes, the amount spent plus the amount left must equal the starting amount. Your child can add those two parts to check a decimal remainder, making sure both amounts use the same money unit before comparing the total.

How to practise these questions

The Basic question combines a total mass with a difference to find the larger amount. Intermediate questions cover repeated groups, extra amounts, three related lengths, equal and unequal removals, and a transfer that makes two quantities equal. Other Intermediate items connect purchase comparisons with a further price calculation, multiplication with a combined mass, or subtraction with equal sharing and rounding. There are no Challenge-labelled questions in this set. Ask your child to describe what changes and what remains related before calculating. After each step, name the amount just found and explain why it helps with the next step; finish by testing the result against the story's total, difference or final condition.

Questions parents ask

How can I support a multi-step problem without giving the steps away? Ask what can be found from the information already given, then what that new amount helps your child find next. Have them name each result in words. A calculation becomes easier to assess when it is identified as a total cost, an extra amount or the cost of one item.

Does every decimal word problem need a bar model? A model can help your child interpret totals, differences and equal amounts, but a direct calculation may be enough when the relationship is clear. Encourage your child to explain what each number represents. The explanation matters even when they can solve the problem without drawing a model.

Should my child round every decimal answer in mixed practice? Only round when the question requests an approximation or a specified degree of accuracy. An exact answer should retain its exact value. In a problem with several steps, keep unrounded intermediate values where needed and apply the final instruction to the quantity the question asks for.