Intermediate
40 mins
Teacher/Student led
+65 XP
Teacher-led from the board. Pupils do not need a device, but can follow on one.

Comparing Numbers to 99: the Tens Decide First

In this maths lesson you compare numbers to ninety nine by checking the tens digit before the units. You will sort cards and circle bigger numbers while noticing how place value works.

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    1 - Getting Started ~3 mins

    Illustration for Getting StartedDara gathered 47 conkers. Ella gathered 51. Who has more?

    2 - Watch and Notice ~8 mins

    Two numbers built with tens rods and unit cubes. Look at the tens rods first: which number has more tens?

    51 has more tens, so 51 is more. We check the tens before the units.

    Now these two share the same tens. What do we look at next?

    Same tens, so the units decide. 36 is more than 32.

    3 - Try It Together ~10 mins

    We sort one pair at a time, and we check the tens first every time.

    Which is more?

    4 - Circle the Bigger Number ~5 mins

    COPYBOOK MOMENT

    In your maths copy, write each pair. Circle the bigger number and underline the place that decided (tens or units):

    • 25 and 52
    • 44 and 41
    • 38 and 83

    5 - Class Challenge ~8 mins

    Work through these pairs: 34 and 29, then 56 and 58, then 81 and 79, then 63 and 36. Sort each pair into More and Fewer. The last pair uses the same numbers in different places — 6 tens or 6 units?

    Pick the bigger number

    Pupil practice
    Module 4 · Place Value: Tens and Units to 99 Number
    Lesson 46 · Comparing Numbers to 99: the Tens Decide First
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