Number (add/sub)

Hong Kong

Stage 1

We know that $14-13=1$14−13=1.

Use this to find:

a

$34-13=\editable{}$34−13=

b

$44-13=\editable{}$44−13=

c

$54-13=\editable{}$54−13=

d

$74-13=\editable{}$74−13=

Easy

1min

Use what you know about subtracting to find:

Easy

1min

We know that $29-14=15$29−14=15.

Use this to find:

Easy

1min

We know that $38-25=13$38−25=13.

Use this to find:

Easy

1min

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