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Fact families

Fact families: three numbers that give two adding facts and two taking-away facts. This shows that subtraction is finding a missing part.

Make a sheetDownload PDFThe PDF has this sheet, its answer key and a guide for grown-ups.

How to help

The biggest number is the whole; the other two are its parts. Part + part = whole, either way round. Whole − one part = the other part.

Watch for: Starting a subtraction with a part: 3 − 13 instead of 13 − 3. Bringing in a number that isn't one of the three. Writing the same fact twice instead of both turn-arounds.

At home: Put 10 spoons down and hide some under a towel. Say how many you see; your child tells how many are hiding and says the take-away fact.

Sample sheet and answer key

Freddie's Frog Pond

Grade 1 · Fact families · 1.OA.B.4

NameDate

Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!

Fact families

Use the three numbers to write two adding and two taking-away facts.

13310
+=+=−=−=
1284
+=+=−=−=
752
+=+=−=−=
68
+=+=−=−=

Think addition

Find the missing part. Both facts in a row have the same answer.

9 += 1818 − 9 =8 += 1616 − 8 =9 += 1313 − 9 =
Mathness! Math Worksheets · © 2026 Zubin KhavarianCode 1OAB4-PO-FIRST at mathness.app
Sheet

Freddie's Frog Pond

Grade 1 · Fact families · 1.OA.B.4

Answer key

Freddie the frog lives in a busy pond full of bugs, lily pads and friends. Solve each problem to help Freddie out!

Fact families

Use the three numbers to write two adding and two taking-away facts.

13310
3+10=1310+3=1313−3=1013−10=3
1284
8+4=124+8=1212−8=412−4=8
752
5+2=72+5=77−5=27−2=5
1468
6+8=148+6=1414−6=814−8=6

Think addition

Find the missing part. Both facts in a row have the same answer.

9 +9= 1818 − 9 =98 +8= 1616 − 8 =89 +4= 1313 − 9 =4
Mathness! Math Worksheets · © 2026 Zubin KhavarianCode 1OAB4-PO-FIRST at mathness.appAnswer key
Answer key

New problems every time, three levels (gentle, core and stretch), themes to pick from, a second page if you want one. Each sheet comes with an answer key and a one-page guide for grown-ups.

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Standard

Common Core 1.OA.B.4 · Think of subtraction as finding a missing addend.

Also: Maryland 2025 1.NOS.C.8 · Texas TEKS 1.5F · Florida B.E.S.T. MA.1.AR.2.1 · Virginia SOL 1.CE.1

Drill sheets for more practice

More grade 1 sheets: operations & algebraic thinking