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Grade 4 · unit review

Review: Use Large Whole Numbers and Explain Algorithms

Read larger place values, round them, multiply, and divide with interpreted remainders.

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Bring the unit skills together

Use these 4 new cases to check your reasoning. Choices are temporary and are not saved to an account, sent to staff or recorded as school grades. Download your current review choices before leaving or reloading.

Unit review questions
1. What number is 12438 multiplied by ten?
Need a hint?
  • Read a digit together with its place name.
  • A zero placeholder is necessary even though it contributes no groups.
2. Round 31172 to the nearest thousand, with midpoint ties upward.
Need a hint?
  • Use the requested place’s midpoint.
  • Repeated rounding can differ from rounding the original number directly.
3. Find 27×35 using partial products.
Need a hint?
  • Write the tens partial product with its full value.
  • Every part of the split factor must be multiplied.
4. 129 cards go into packets of 6. How many completely filled packets can be made?
Need a hint?
  • Check that the remainder is smaller than one full group.
  • Round up only when the question requires capacity for every item.

The download contains your current choices and any checked feedback. Keep the separate transfer-task work in your own document; downloading its instructions does not mark it complete.

Use the skills in a new task

A club has 157 cards and packets hold six. Find complete packets and leftovers, and explain a request to pack every card.

Work on paper or in your own document. Explain the choices you made.

  • Draw or label the numbers or shape features the task gives you.
  • Say why each calculation or shape choice follows the ideas in this unit.
  • Check that your answer fits the story or drawing in the task.
Compare with a model response

157=6×26+1, so there are 26 complete packets and one leftover card. To give every card a packet, 27 packets are needed, with the last partly filled. The context changes how the remainder is reported.

A different response can also meet the criteria. Compare the evidence and reasoning, rather than copying the wording.