1 rod and 3 units is the required answer if there are 4 base ten blocks and their value is less than 20, given that some are rods and some are units. This can be obtained by finding number of rods and units that can add up to a number less than 20.
Calculate the required number of rods and units:
1 rod has the value 10, and one unit has the value 1.
There are many combination of rods and units,
- 3 rods and 1 unit =(3×10) + (1×1) = 31 > 20; is not the required answer
- 2 rods and 2 units =(2×10) + (2×1) = 22 > 20; is not the required answer
- 1 rod and 3 units =(1×10) + (3×1) = 13 < 20; is the required answer
Hence 1 rod and 3 units is the required answer if there are 4 base ten blocks and their value is less than 20, given that some are rods and some are units.
Learn more about base ten blocks here:
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