The biggest number is the whole; the other two are its parts. Part + part = whole, either way round. Whole − one part = the other part.
fact familyfacts that use the same three numbers
partone of the pieces that make the whole
wholeall of it, the biggest number
subtracttake away to find what is left
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.
+=+=−=−=
+=+=−=−=
+=+=−=−=
+=+=−=−=
Think addition
Find the missing part. Both facts in a row have the same answer.
9 += 1818 − 9 =8 += 1616 − 8 =9 += 1313 − 9 =
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.
3+10=1310+3=1313−3=1013−10=3
8+4=124+8=1212−8=412−4=8
5+2=72+5=77−5=27−2=5
6+8=148+6=1414−6=814−8=6
Think addition
Find the missing part. Both facts in a row have the same answer.
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.