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Mastering Addition and Subtraction Strategies for Numbers up to 20

Develop fundamental addition and subtraction skills with this interactive course. Learn how to use near doubles, number lines, and jump strategies to solve problems up to 20. Practice with dual-step problems and explore various counting techniques for calculations.

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Mastering Addition and Subtraction Strategies for Numbers up to 20

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  1. Add and Subtract I can use materials or drawings to show how numbers fit together to 20. I can make organised lists showing the numbers that fit together to 20. I can add near doubles by thinking about doubles.

  2. I can use basic facts to work out new facts (e.g. 8+7 = 15 so 18+7 = 25). I can use a number line to show how I count on or back to add or subtract. I can think about addition to help me subtract (e.g. for 24 – 18, think 18 add what makes 24). I can use a jump strategy to add past a ten (e.g. 26 + 8 = 26 + 4( = 30) + 4).

  3. I can count on or back in tens to help add or subtract (e.g.28 + 37 = 28 + 30 + 7 = 58 + 7). I can add or subtract 8 and 9 by adding or subtracting ten then adjusting. I can solve a two step problem.

  4. I can use materials or drawings to show the parts and the whole in a number story. I can skip count in 2s, 5s or 10s to help me add or subtract. I can use a part-part-whole diagram to decide if I should add or subtract. I can use a part-part-whole diagram to help me write a number sentence.

  5. I can use the add, subtract, equals and constant keys. I can name some of the keys on a calculator. I can enter a given number into a calculator.

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