Number (add/sub)
Hong Kong
Stage 1
Addition fact families (a+b=c, c-b=a)
Interactive practice questions
We are interested in the fact family of $1$1,$8$8 and $9$9.
 |
$+$+ |  |
$=$= |  |
| $8$8 | $+$+ | $1$1 | $=$= | $9$9 |
a
What is $1+8$1+8?
b
What is $9-8$9−8?
c
What is $9-1$9−1?
Easy
< 1min
We are interested in the fact family of $4$4,$6$6 and $10$10.
Easy
< 1min
We are interested in the fact family of $5$5,$5$5 and $10$10.
Easy
< 1min
We are interested in the fact family of $2$2, $4$4 and $6$6:
Easy
< 1min
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