1 What calculationsare represented?
The first onehasbeendone foryou.
a)
15 + 5 = 20
b)
+ =
c)
+ =
d) Howmanyothernumberbonds to20 canyoumake using countersand ten frames?
Fact families – addition and subtraction bonds to 20
2 Complete the fact family.
a)15 + 2 = 17
17 = 15 + 2
2 + 15 =
= +
17 − 15 =
= −
− =
= −
b)
ExplainwhyRosie iswrong.
©WhiteRoseMaths2019
2 – 17 = 15 should be in the fact family.
3 Complete thenumber sentences for the part-wholemodel.
+ =
− =
+ =
− =
Are there anyothernumber sentences in thisfact family?
Talk about itwithapartner.
4 Thereare9 boysand 8girls ina class.
Complete thebarmodel to represent this.
9 8
Write the fact family for thebarmodel.
5 Circleany incorrect calculations.
3+7=10 10=3+7
7+3=10 10=7+3
10−7=3 7−3=10
3−10=7 7=10−3
Explain themistake thathasbeenmade.
6 Hereare somenumber cards.
Choose twonumber cardsandfind their total.
+ =
Write the fact family for this calculation.
Compareanswerswithapartner.
©WhiteRoseMaths2019
11
5 6
5 2 7 13 6
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