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Ffocws dysgu

Dysga drosi unedau o hyd metrig yn unedau llai, er enghraifft cm yn mm, m yn cm, km yn m.

Mae'r wers hon yn cynnwys:

• ffeithiau mathemategol am unedau o hyd
• dau weithgaredd

Learning focus

Learn to convert metric units of length to smaller units, for example cm to mm, m to cm, km to m.

This lesson includes:

• mathematical facts about units of measure
• two activities

Wedi ei chreu mewn partneriaeth â .

Y system fetrig / The metric system

Mae'r system fetrig yn ddull o fesur pethau.

Wrth ddelio â hyd, y mesuriadau metrig yw:

• milimetrau
• centimetrau
• metrau
• cilometrau

The metric system is a method of measuring objects.

In dealing with length, the metric measurements are:

• millimetres
• centimetres
• metres
• kilometres

Rydyn ni’n defnyddio’r system fetrig i fesur hyd, pwysau neu gyfaint rhywbeth.

Caiff hyd ei fesur mewn milimetrau (mm), centimetrau (cm), metrau (m) neu mewn cilometrau (km).

The metric system is used to measure the length, weight or volume of an object.

Length is measured in millimetres (mm), centimetres (cm), metres (m) or kilometres (km).

• 1 cm = 10 mm
• 1 m = 100 cm
• 1 km = 1000 m
• tua lled stwffwl yw 1 cm / 1 cm is about the width of a staple
• tua lled gwely sengl yw 1 m / 1 m is about the width of a single bed

Caiff pwysau ei fesur mewn gramau (g) a chilogramau (kg)

Weight is measured in grams (g) and kilograms (kg)

• 1 kg = 1000 g
• 1 l = 1000 ml
• 1 kg yw pwysau saith afal / 1 kg is the weight of seven apples

Gweithgaredd 1 / Activity 1

Lawrlwytha'r linc isod o wefan Twinkl er mwyn ymarfer dy sgiliau mesur.

Download the link below from the Twinkl website to practise your measuring skills.

Gweithgaredd 2 / Activity 2

Cwblha'r symiau isod. Complete the sums below.

1. 5 cm = ___ mm
2. 7.5 m = ___ cm
3. 6 km = ___ m
4. 3500 m = ___ km
5. 25 mm = ___ cm
6. 800 cm = ___ m

Nodiadau i rieni

Ar ddiwedd y wers dylai disgyblion wybod:

• y gallwn fesur hyd gan ddefnyddio’r mesuriadau metrig yma: milimetrau, centimetrau, metrau a chilometrau
• bod 10 mm mewn cm, 100 cm mewn m, a 1000 m mewn km
• bod mm = milimetrau, cm = centimetrau, m = metrau, a km = cilometrau

Notes for parents

After the lesson, pupils should know:

• we can measure length using these metric units: millimetres, centimetres, metres and kilometres
• that there are 10 mm in a cm, 100 cm in a metre, and 1000 m in a km
• that mm = millimetres, cm = centimetres, m = metres, and km = kilometres