GRADE 1 · ALBERTAOUTCOME AB-G1-1N2
L5 · Number facts clinic: addends to 10 and their subtraction partners
Learning goal
“I can say addition facts with addends to 10 fast, and say their subtraction partners.”
Partner fact — the subtraction fact that belongs with an addition fact. 7 + 3 = 10 has partners 10 − 3 = 7 and 10 − 7 = 3.
Recall — say the answer fast, without counting.
Subtraction partner — taking the whole apart again: the whole take away one part gives the other part.
Worked example
Recall: 7 + 3 = 10. Now say its partners without counting: 10 − 3 = 7 and 10 − 7 = 3. One fact learned, three facts known: the whole is 10, the parts are 7 and 3, and taking the whole apart gives a part back.
Check yourself — explain it
Why is 10 − 3 = 7?
Paired problem — example still visible
4 + 6 = 10. What is 10 − 6? -> 4 (the partner gives back the other part)
Faded completion — last step is yours
"8 + 2 = 10, so 10 − 2 = ___" -> 8
Ready to practise?
8 scored questions with a 3-rung hint ladder. Mastery needs 7/8 plus both gate questions.