math test

Tablet

8cm+8cm=16cm

12cm+12cm=24cm

24cm+16cm=40cm

Forest block

5km+9km+11km+7km= 32km
Stamp

18mm+18mm=36mm

14mm+14mm=28mm

28mm+36mm=64mm

School ground

90m+110m+260m+210m+190m=860m

Happy Birthday card

14cm+14cm=28cm

20cm+28cm=48cm

The block

1+3+1\2+1\2=6

6x8=48