Tens and ones

Grade 1 · Number sense and place value

Base-ten blocks: a rod is ten cubes joined together, and a loose cube is one. Some questions show a number and ask the student to build it with blocks; others show blocks and ask which number they make.

Building accepts any mix that adds up, so 2 rods and 14 cubes is as right as 3 rods and 4 cubes. Some questions run short of rods, so a ten has to be made from ten cubes.

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What changes each time

• Numbers from 11 to 99
• Build the number, or read the blocks
• Wrong choices based on real slips, like 43 for 34

More number sense and place value practice

• Comparing numbers (<, = and >) (Grade 1)
• Hundreds, tens and ones (Grade 2)
• Odd and even numbers (Grade 2)
• Writing numbers in digits (Grade 3)
• Place value (Grade 3)
• Smallest and largest numbers (Grade 3)
• Rounding on a number line (Grade 3)
• Making numbers with 1, 2, 4 and 8 (Grade 3)
• Negative numbers on a number line (Grade 4)
• Halfway between two numbers (Grade 4)
• Nth largest and smallest numbers (Grade 5)

All practice topics