Lesson 2

Estimating Sums

Est. Class Sessions: 2

Daily Practice and Problems

Teacher Notes
X

Use DPP item G to provide practice with subtraction related to the addition facts in Group F. Some students may use thinking addition as a possible solution strategy. Have 200 Charts readily available.

  1. 80 cents;
    170 − 90 = 80 cents
  2. 90 cents;
    180 − 90 = 90 cents

G. Money to Spend

  1. Frank had 170 pennies to spend. He bought a valentine card for 90 cents. How much money did he have left? Write a number sentence.
  2. Miguel had 180 pennies to spend. He bought a pack of gum for 90 cents. How much money did he have left? Write a number sentence.