Skills Covered

How to Use This Pack

Five pages about making 100. On page 1 each 10 by 10 grid has some squares shaded: students count the empty squares, by tens and then ones, and write the number that makes 100. Page 2 shows each number in base-ten blocks: students count the tens rods and ones and write how many more make a hundred. Page 3 uses number lines: start at the dot, jump to the next ten, then jump by tens to 100, and add the jumps (64 to 70 to 100 is 6 + 30 = 36). Page 4 has six numbers to join with their partners that make 100, and three ladders of sums to fill in: tens and fives, numbers close to 100, and a mix. Page 5 has six word problems, each with a picture: write the sum that makes 100, then the answer. The first problem on pages 1, 2 and 3 is done as an example.

In the Classroom

Hand out hundred charts or 10 by 10 grids and have partners shade a number, then trade and find how many more make 100. Model page 3 on the board: start at 64, jump 6 to 70, then count 80, 90, 100 out loud while making the three jumps of ten. Ask students to explain why the ones in a pair always add to 10 (or both are 0) and the tens add to 90 (or 100).

At Home

Play "Make 100": say a number and let your child say its partner, then switch. Count out 100 pennies or beads into a jar and ask how many more are needed after each handful. A 100-piece puzzle is a good one: how many pieces are left?

Tips for Success

• Jump to the next ten first, then count the tens to 100
• The ones add up to 10 and the tens add up to 90, unless the number ends in 0
• For a number like 70, only the tens change: 70 + 30 = 100
• Check with the grid: shaded and empty squares together make 100
• Numbers close to 100 need only a little more: 99 + 1, 96 + 4