We have been working on the “Greedy 9” and “Greedy 99” strategy to help us add and subtract numbers. This is a great strategy to practice at home to develop fluency for mental math for both 1 and 2 digit numbers.
A couple things you can do at home to help with this strategy are:
-Practice what number is 10 less and 10 more than a given number. Ask what is 10 less than 13, 25, 89, 134, 205 etc. This is great to practice while walking or driving somewhere.
-Practice adding and subtracting 9 or 99 using the Greedy 9 or Greedy 99 strategy. Start with subtracting 9 and then move to more challenging numbers when your child seems more confident in this strategy.
Always keep it positive.
Here are some examples,
15-9=
Think: 15-10=5 +1=6
So 15-9=6
27-9=
Think: 27-10=17+1=18
85-9=
Think:
85-10=75+1=76
34-19=
Think:
34-20+1=
144-99=
Think:
144-100=44+1=45
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