Lesson 9 - SharpSchool
7 threes = 5 threes + 2 threes 7 x 3 = 5 x 3 + 2 x 3 21 = 15 + 6Sample teacher boardT:How many threes did you add to 5 × 3 to make the array show 7 × 3? ... Have students subtract to find the answer to 8 × 3. 10 × 3 is the basic fact, so the subtraction to find 8 × 3 is 30 – 6. T:Tell your partner how we used 10 × 3 to help us find the ... ................
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