Math-U-See’s Integer Block Kit is a complete set of all 133 pieces that students need for Math-U-See levels Primer through Algebra 1 (curriculum sold separately), priced right to so families with more than one child in Math-U-See can have extra blocks on hand. Or get an extra set for your budding architect who likes to use the blocks for building projects! Each set consists of 20 ones and tens, 13 fives, and 10 each of twos, threes, fours, sixes, sevens, eights, nines, and hundreds blocks, plus the Decimal Street/Block Clock poster. Please note that the Math U See Integer Blocks have small parts and are not toys. They are recommended for children ages 4 and above.