Mental Math
365 - 20
345
Count by tens starting at 220.
220, ___, ___, ___
230, 240, 250
865 - 14
851
8 hundreds, 5 tens, and 6 ones.
20
245 - 40
205
Count by tens starting at 415.
415, ___, ___, ____
425, 435, 445
271 - 92
179
True or False?
660 is the same as six hundreds, six tens and zero ones.
Roseann collected 173 items for two different animal shelters. She gave 60 items to one animal shelter. How many items are left to give to the other animal shleter?
113
999 - 90
909
Count by hundreds starting at 412.
412, ___, ___, ___
512, 612, 712
180 - 68
112
True or False?
245 is the same as 1 hundred, 14 tens and 5 ones.
True.
Mrs. Palumbo had 471 papers to grade. She was able to grade 271 papers over the weekend. How many more papers will she need to grade?
200
1045 - 20
1025
Count by hundreds starting at 789.
789, ___, ___, ___
889, 989, 1089
247 - 59
188
True or False?
623 is the same is 4 hundreds, 20 tens and 3 ones.
False.
The Easter bunny hid 990 eggs for the hunt. So far, 543 eggs were found. How many more eggs need to be found?
447
905 - 30
975
Count BACK by tens starting at 912.
912, ___, ___, ___
902, 892, 882
901 - 92
809
587 is the same as 4 hundreds, ___ tens, and ____ ones.
4 hundreds, 18 tens, and 7 ones.
Aleen brought 400 pieces of candy to give out to her classmates. She gave out 200 pieces on Monday and 100 pieces on Tuesday. On Wednesday, she gave out more pieces of candy but went home with 40 pieces remaining. How many pieces of candy did she give out on Wednesday?
60