The Life Starter
Sign up
Grade 1 · unit review

Review: Count to 120 and Add with Place Value

Continue through one hundred and use tens and ones when adding or subtracting.

Download reviews and answer keys

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. Start at 100 and count forward three steps. Which numeral is the stopping point?
Need a hint?
  • Use a new box for each counting step.
  • Counting does not restart at one after ninety-nine.
2. Use tens and ones to find 67+8.
Need a hint?
  • An exchanged ten still represents ten original ones.
  • Do not keep ten ones in the ones column after also recording their new ten.
3. Find 26+60 by adding full tens.
Need a hint?
  • Read thirty as three tens, not three ones.
  • Adding full tens does not change the ones count.
4. Subtract full tens: 80−20.
Need a hint?
  • Five tens means fifty objects.
  • Do not report only the number of tens when the question asks for the whole amount.

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

Find 46+8 with a tens-and-ones drawing, then continue the numeral sequence 98,99,__ ,__ .

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

46+8 has four tens and fourteen ones. Exchange ten ones for a ten: five tens and four ones, or 54. The sequence continues 100,101.

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