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Addition within 20 worksheets

The Grade 1 workhorse. Sums that cross the ten boundary, where number sense gets built.

Grade 1

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About addition within 20

Adding within 20 is the year's main event in Grade 1. The interesting part is not 4 + 3 — it is 8 + 5, where the answer crosses ten and a child has to do something cleverer than count on.

The strategy worth teaching is 'make ten': 8 + 5 becomes 8 + 2 + 3. Once a child sees that, the rest of the year gets easier. Most children need dozens of repetitions before it becomes automatic, which is exactly what a generator is good for.

What actually helps

  • Watch for the sums that cross ten — those are the ones that need repeating.
  • Doubles (6+6, 7+7) and near-doubles are worth memorising outright.
  • Twenty questions is a normal Grade 1 page. Time it if they enjoy that, don't if they don't.

Common questions

What is 'making ten' and why does it matter?

It is regrouping a sum so one part reaches ten first: 8 + 5 becomes 8 + 2 + 3 = 13. It matters because it is the same move used later in two-digit addition with regrouping.

My child knows the answers but is very slow. Is that a problem?

Not on its own. Speed follows familiarity. Short daily practice does more for it than longer sessions, and timing a child who finds it stressful usually backfires.

Addition within 20 worksheets from Pencil Pocket — free printable practice for Grade 1

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