This task is an application of double-digit subtraction. Students must critique student work that uses subtraction incorrectly. The student work highlights a common error in multi-digit subtraction in which students forget to borrow when subtracting a larger digit from a smaller digit. The task encourages partner share and uses argumentation language including claim and evidence.
Microsoft Word version: 3_NBT_SubtractionMultiDigitAlgorithm_Problem_Critique
PDF version: 3_NBT_SubtractionMultiDigitAlgorithm_Problem_Critique
Airplanes in the Toyshop is a multi-digit subtraction problem used in a third-grade classroom to reinforce the use of the subtraction algorithm. Students are given a word problem about how many planes are left after a certain amount are sold and must critique a student response. Argumentation language is used when asking students to create a claim and provide evidence when critiquing the provided response.
Microsoft Word version: 3_NBT_SubtractionMultiDigitAlgorithm_Problem_Critique_AirplanesInTheToyshop
PDF version: 3_NBT_SubtractionMultiDigitAlgorithm_Problem_Critique_AirplanesInTheToyshop
Miss Blue is a problem about rounding in which students are asked to critique the work of two students. Both students are asked to round to the nearest tenth; one student rounds down and the other rounds up. Students must decide with whom they agree and explain the choice.
Microsoft Word version: 3_NBT_RoundingNearestTen_Problem_Critique_MissBlue
PDF version: 3_NBT_RoundingNearestTen_Problem_Critique_MissBlue
This task is designed for third graders to introduce rounding numbers to the nearest hundred. The task instructions include background knowledge on rounding to the nearest ten and argumentative language when asking the students to create a conjecture about how to round and how rounding to the nearest hundred compares to the nearest ten. Students are asked to practice the idea using a three-digit number.
Microsoft Word version: 3_NBT_RoundingNearestHundred_ThinkPairShare_Conjecture
PDF version: 3_NBT_RoundingNearestHundred_ThinkPairShare_Conjecture
This task requires third grade students to find a halfway point between two numbers (30 and 40) and construct an argument explaining how he or she knows that their number is the halfway point. Students are also asked to engage in a think-pair-share in which they discuss the process with a partner. The task may lead to a good discussion about medians or about rounding and how to round to the nearest tenth when a number ends in a 5.
Microsoft Word version: 3_NBT_Rounding_ThinkPairShare_Construct
PDF version: 3_NBT_Rounding_ThinkPairShare_Construct