B3.1.2.3.1 Mathematics Lesson Plan Indicator | Genesis OS
Basic 3 Mathematics lesson plan for NaCCA indicator B3.1.2.3.1: Use strategies to mentally add and subtract whole numbers within 100 E.g. 1 Use strategies studied in B1 and B2 (counting up, counting down, making doubles, making doubles plus or minus 1 or 2, making 10s, rearranging order of additions to make friendlier combinations, converting a subtraction into an addition and solving the addition) to demonstrate mastery of basic addition facts to 18 (and related subtraction facts) E.g.2 Make doubles when both numbers are close to doubles or when one number is close to the double of the other by: - decomposing one of the numbers to create doubles (e.g. when adding 25 + 26, think 25 + 25 + 1) or - shifting a quantity from one number to the other to create doubles (e.g., when adding 24 + 26, think 25 + 25, or when adding 69 + 23, think 70 + 22) E.g. 3 Make 10s when one number is close to 10 or to multiples of 10 by shifting a quantity from one number to the other to create a multiple of 10 (e.g. for example, instead of 28 + 47, think 30 + 45, which is the equivalent of moving 2 from 47 to 28 or think 25 + 50, which is the equivalent of moving 3 from 28 to 45)
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