Number Sense Talks: Explaining Math Thinking in Grade 3
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Date:
Today I am practising: Number sense to 1,000, including rounding, estimating sums, and explaining strategies clearly.
Round 348 to the nearest hundred. Explain which two hundreds it falls between.
Without calculating exactly, decide whether 198 + 205 is closer to 400 or 500. Explain your estimate.
Which is greater: 506 or 560? Describe the value of the 5 in each number to support your answer.
A jar holds 275 beads. Another jar holds 298 beads. About how many beads are there in all? Round each number first, then estimate.
Write a number between 400 and 500 that has a 9 in the tens place. Then write the number that is 10 more.
Lena says 703 is greater than 730 because 3 is greater than 0 in the ones place. Explain whether her reasoning works and give the correct comparison.
- Ask your child to talk through each strategy before writing, and prompt with questions such as How did you start? and Does your answer make sense?