N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 1 Q Question Answer 1 ☐ + 19 = 20 2 ☐ + 11 = 20 3 3 + ☐ = 20 4 2 + ☐ = 20 5 ☐ + 13 = 20 6 2 + ☐ = 20 7 13 + 7 = ☐ 8 2 + ☐ = 20 9 ☐ + 1 = 20 10 11 + ☐ = 20 11 ☐ + 1 = 20 12 10 + ☐ = 20 13 16 + ☐ = 20 14 17 + 3 = ☐ 15 ☐ + 13 = 20 16 ☐ + 7 = 20 17 ☐ + 8 = 20 18 6 + ☐ = 20 19 ☐ + 5 = 20 20 14 + ☐ = 20    

Day 2 Q Question Answer 1 15 + 5 = ☐ 2 ☐ + 12 = 20 3 9 + 11 = ☐ 4 ☐ + 12 = 20 5 19 + ☐ = 20 6 9 + ☐ = 20 7 9 + 11 = ☐ 8 9 + 11 = ☐ 9 19 + ☐ = 20 10 15 + 5 = ☐ 11 1 + 19 = ☐ 12 9 + ☐ = 20 13 ☐ + 8 = 20 14 ☐ + 8 = 20 15 ☐ + 20 = 20 16 9 + ☐ = 20 17 ☐ + 20 = 20 18 ☐ + 8 = 20 19 9 + ☐ = 20 20 ☐ + 5 = 20    

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 3 Q Question Answer 1 9 + ☐ = 20 2 18 + ☐ = 20 3 5 + ☐ = 20 4 ☐ + 14 = 20 5 16 + ☐ = 20 6 ☐ + 7 = 20 7 18 + ☐ = 20 8 ☐ + 18 = 20 9 ☐ + 11 = 20 10 18 + ☐ = 20 11 16 + 4 = ☐ 12 17 + 3 = ☐ 13 2 + ☐ = 20 14 18 + ☐ = 20 15 13 + ☐ = 20 16 ☐ + 17 = 20 17 17 + 3 = ☐ 18 5 + ☐ = 20 19 ☐ + 13 = 20 20 16 + ☐ = 20    

Day 4 Q Question Answer 1 ☐ + 10 = 20 2 6 + ☐ = 20 3 ☐ + 10 = 20 4 4 + ☐ = 20 5 ☐ + 10 = 20 6 15 + ☐ = 20 7 ☐ + 6 = 20 8 15 + ☐ = 20 9 6 + ☐ = 20 10 ☐ + 8 = 20 11 8 + ☐ = 20 12 12 + ☐ = 20 13 4 + ☐ = 20 14 6 + ☐ = 20 15 1 + 19 = ☐ 16 12 + ☐ = 20 17 19 + 1 = ☐ 18 ☐ + 8 = 20 19 4 + ☐ = 20 20 19 + ☐ = 20    

 

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 5 Q Question Answer 1 13 + ☐ = 20 2 10 + ☐ = 20 3 5 + ☐ = 20 4 10 + 10 = ☐ 5 ☐ + 11 = 20 6 11 + ☐ = 20 7 ☐ + 6 = 20 8 14 + ☐ = 20 9 ☐ + 10 = 20 10 18 + ☐ = 20 11 ☐ + 15 = 20 12 ☐ + 6 = 20 13 ☐ + 6 = 20 14 ☐ + 17 = 20 15 13 + ☐ = 20 16 ☐ + 17 = 20 17 13 + ☐ = 20 18 7 + ☐ = 20 19 ☐ + 6 = 20 20 14 + ☐ = 20    

Day 6 Q Question Answer 1 ☐ + 6 = 20 2 11 + ☐ = 20 3 11 + ☐ = 20 4 16 + ☐ = 20 5 10 + 10 = ☐ 6 11 + ☐ = 20 7 3 + ☐ = 20 8 4 + 16 = ☐ 9 3 + ☐ = 20 10 ☐ + 13 = 20 11 ☐ + 8 = 20 12 ☐ + 4 = 20 13 16 + ☐ = 20 14 19 + ☐ = 20 15 2 + ☐ = 20 16 ☐ + 20 = 20 17 20 + ☐ = 20 18 ☐ + 20 = 20 19 14 + ☐ = 20 20 ☐ + 8 = 20    

     

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 7 Q Question Answer 1 2 + ☐ = 20 2 14 + ☐ = 20 3 ☐ + 13 = 20 4 14 + ☐ = 20 5 4 + ☐ = 20 6 10 + ☐ = 20 7 9 + ☐ = 20 8 9 + ☐ = 20 9 15 + ☐ = 20 10 8 + ☐ = 20 11 ☐ + 8 = 20 12 15 + 5 = ☐ 13 ☐ + 12 = 20 14 14 + ☐ = 20 15 15 + ☐ = 20 16 10 + ☐ = 20 17 ☐ + 13 = 20 18 8 + ☐ = 20 19 ☐ + 13 = 20 20 4 + ☐ = 20    

Day 8 Q Question Answer 1 ☐ + 3 = 20 2 ☐ + 13 = 20 3 20 + ☐ = 20 4 15 + ☐ = 20 5 16 + ☐ = 20 6 ☐ + 11 = 20 7 ☐ + 20 = 20 8 2 + 18 = ☐ 9 ☐ + 3 = 20 10 ☐ + 19 = 20 11 ☐ + 3 = 20 12 17 + ☐ = 20 13 15 + ☐ = 20 14 ☐ + 11 = 20 15 15 + ☐ = 20 16 5 + 15 = ☐ 17 16 + ☐ = 20 18 ☐ + 4 = 20 19 10 + ☐ = 20 20 ☐ + 4 = 20    

 

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 9 Q Question Answer 1 ☐ + 15 = 20 2 ☐ + 14 = 20 3 ☐ + 11 = 20 4 1 + ☐ = 20 5 ☐ + 11 = 20 6 ☐ + 13 = 20 7 8 + ☐ = 20 8 9 + ☐ = 20 9 ☐ + 20 = 20 10 17 + 3 = ☐ 11 15 + ☐ = 20 12 12 + 8 = ☐ 13 ☐ + 3 = 20 14 9 + ☐ = 20 15 15 + ☐ = 20 16 5 + ☐ = 20 17 ☐ + 17 = 20 18 1 + 19 = ☐ 19 11 + ☐ = 20 20 ☐ + 20 = 20    

Day 10 Q Question Answer 1 19 + ☐ = 20 2 6 + ☐ = 20 3 ☐ + 2 = 20 4 17 + 3 = ☐ 5 6 + ☐ = 20 6 17 + 3 = ☐ 7 ☐ + 11 = 20 8 ☐ + 9 = 20 9 7 + ☐ = 20 10 ☐ + 4 = 20 11 ☐ + 2 = 20 12 10 + ☐ = 20 13 19 + ☐ = 20 14 ☐ + 13 = 20 15 7 + ☐ = 20 16 ☐ + 4 = 20 17 ☐ + 3 = 20 18 16 + ☐ = 20 19 ☐ + 1 = 20 20 8 + ☐ = 20    

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 1 Q Question Answer 1 ☐ + 19 = 20 1 2 ☐ + 11 = 20 9 3 3 + ☐ = 20 17 4 2 + ☐ = 20 18 5 ☐ + 13 = 20 7 6 2 + ☐ = 20 18 7 13 + 7 = ☐ 20 8 2 + ☐ = 20 18 9 ☐ + 1 = 20 19 10 11 + ☐ = 20 9 11 ☐ + 1 = 20 19 12 10 + ☐ = 20 10 13 16 + ☐ = 20 4 14 17 + 3 = ☐ 20 15 ☐ + 13 = 20 7 16 ☐ + 7 = 20 13 17 ☐ + 8 = 20 12 18 6 + ☐ = 20 14 19 ☐ + 5 = 20 15 20 14 + ☐ = 20 6    

Day 2 Q Question Answer 1 15 + 5 = ☐ 20 2 ☐ + 12 = 20 8 3 9 + 11 = ☐ 20 4 ☐ + 12 = 20 8 5 19 + ☐ = 20 1 6 9 + ☐ = 20 11 7 9 + 11 = ☐ 20 8 9 + 11 = ☐ 20 9 19 + ☐ = 20 1 10 15 + 5 = ☐ 20 11 1 + 19 = ☐ 20 12 9 + ☐ = 20 11 13 ☐ + 8 = 20 12 14 ☐ + 8 = 20 12 15 ☐ + 20 = 20 0 16 9 + ☐ = 20 11 17 ☐ + 20 = 20 0 18 ☐ + 8 = 20 12 19 9 + ☐ = 20 11 20 ☐ + 5 = 20 15    

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 3 Q Question Answer 1 9 + ☐ = 20 11 2 18 + ☐ = 20 2 3 5 + ☐ = 20 15 4 ☐ + 14 = 20 6 5 16 + ☐ = 20 4 6 ☐ + 7 = 20 13 7 18 + ☐ = 20 2 8 ☐ + 18 = 20 2 9 ☐ + 11 = 20 9 10 18 + ☐ = 20 2 11 16 + 4 = ☐ 20 12 17 + 3 = ☐ 20 13 2 + ☐ = 20 18 14 18 + ☐ = 20 2 15 13 + ☐ = 20 7 16 ☐ + 17 = 20 3 17 17 + 3 = ☐ 20 18 5 + ☐ = 20 15 19 ☐ + 13 = 20 7 20 16 + ☐ = 20 4    

Day 4 Q Question Answer 1 ☐ + 10 = 20 10 2 6 + ☐ = 20 14 3 ☐ + 10 = 20 10 4 4 + ☐ = 20 16 5 ☐ + 10 = 20 10 6 15 + ☐ = 20 5 7 ☐ + 6 = 20 14 8 15 + ☐ = 20 5 9 6 + ☐ = 20 14 10 ☐ + 8 = 20 12 11 8 + ☐ = 20 12 12 12 + ☐ = 20 8 13 4 + ☐ = 20 16 14 6 + ☐ = 20 14 15 1 + 19 = ☐ 20 16 12 + ☐ = 20 8 17 19 + 1 = ☐ 20 18 ☐ + 8 = 20 12 19 4 + ☐ = 20 16 20 19 + ☐ = 20 1    

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 5 Q Question Answer 1 13 + ☐ = 20 7 2 10 + ☐ = 20 10 3 5 + ☐ = 20 15 4 10 + 10 = ☐ 20 5 ☐ + 11 = 20 9 6 11 + ☐ = 20 9 7 ☐ + 6 = 20 14 8 14 + ☐ = 20 6 9 ☐ + 10 = 20 10 10 18 + ☐ = 20 2 11 ☐ + 15 = 20 5 12 ☐ + 6 = 20 14 13 ☐ + 6 = 20 14 14 ☐ + 17 = 20 3 15 13 + ☐ = 20 7 16 ☐ + 17 = 20 3 17 13 + ☐ = 20 7 18 7 + ☐ = 20 13 19 ☐ + 6 = 20 14 20 14 + ☐ = 20 6    

Day 6 Q Question Answer 1 ☐ + 6 = 20 14 2 11 + ☐ = 20 9 3 11 + ☐ = 20 9 4 16 + ☐ = 20 4 5 10 + 10 = ☐ 20 6 11 + ☐ = 20 9 7 3 + ☐ = 20 17 8 4 + 16 = ☐ 20 9 3 + ☐ = 20 17 10 ☐ + 13 = 20 7 11 ☐ + 8 = 20 12 12 ☐ + 4 = 20 16 13 16 + ☐ = 20 4 14 19 + ☐ = 20 1 15 2 + ☐ = 20 18 16 ☐ + 20 = 20 0 17 20 + ☐ = 20 0 18 ☐ + 20 = 20 0 19 14 + ☐ = 20 6 20 ☐ + 8 = 20 12    

   

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 7 Q Question Answer 1 2 + ☐ = 20 18 2 14 + ☐ = 20 6 3 ☐ + 13 = 20 7 4 14 + ☐ = 20 6 5 4 + ☐ = 20 16 6 10 + ☐ = 20 10 7 9 + ☐ = 20 11 8 9 + ☐ = 20 11 9 15 + ☐ = 20 5 10 8 + ☐ = 20 12 11 ☐ + 8 = 20 12 12 15 + 5 = ☐ 20 13 ☐ + 12 = 20 8 14 14 + ☐ = 20 6 15 15 + ☐ = 20 5 16 10 + ☐ = 20 10 17 ☐ + 13 = 20 7 18 8 + ☐ = 20 12 19 ☐ + 13 = 20 7 20 4 + ☐ = 20 16    

Day 8 Q Question Answer 1 ☐ + 3 = 20 17 2 ☐ + 13 = 20 7 3 20 + ☐ = 20 0 4 15 + ☐ = 20 5 5 16 + ☐ = 20 4 6 ☐ + 11 = 20 9 7 ☐ + 20 = 20 0 8 2 + 18 = ☐ 20 9 ☐ + 3 = 20 17 10 ☐ + 19 = 20 1 11 ☐ + 3 = 20 17 12 17 + ☐ = 20 3 13 15 + ☐ = 20 5 14 ☐ + 11 = 20 9 15 15 + ☐ = 20 5 16 5 + 15 = ☐ 20 17 16 + ☐ = 20 4 18 ☐ + 4 = 20 16 19 10 + ☐ = 20 10 20 ☐ + 4 = 20 16    

   

N U M E R A C Y N I N J A S . O R G © 2 0 1 5 N U M E R A C Y N I N J A S . A L L R I G H T S R E S E R V E D

Number Bonds To 20 Mental Strategies Complete the daily exercises to focus on improving this skill.

Day 9 Q Question Answer 1 ☐ + 15 = 20 5 2 ☐ + 14 = 20 6 3 ☐ + 11 = 20 9 4 1 + ☐ = 20 19 5 ☐ + 11 = 20 9 6 ☐ + 13 = 20 7 7 8 + ☐ = 20 12 8 9 + ☐ = 20 11 9 ☐ + 20 = 20 0 10 17 + 3 = ☐ 20 11 15 + ☐ = 20 5 12 12 + 8 = ☐ 20 13 ☐ + 3 = 20 17 14 9 + ☐ = 20 11 15 15 + ☐ = 20 5 16 5 + ☐ = 20 15 17 ☐ + 17 = 20 3 18 1 + 19 = ☐ 20 19 11 + ☐ = 20 9 20 ☐ + 20 = 20 0    

Day 10 Q Question Answer 1 19 + ☐ = 20 1 2 6 + ☐ = 20 14 3 ☐ + 2 = 20 18 4 17 + 3 = ☐ 20 5 6 + ☐ = 20 14 6 17 + 3 = ☐ 20 7 ☐ + 11 = 20 9 8 ☐ + 9 = 20 11 9 7 + ☐ = 20 13 10 ☐ + 4 = 20 16 11 ☐ + 2 = 20 18 12 10 + ☐ = 20 10 13 19 + ☐ = 20 1 14 ☐ + 13 = 20 7 15 7 + ☐ = 20 13 16 ☐ + 4 = 20 16 17 ☐ + 3 = 20 17 18 16 + ☐ = 20 4 19 ☐ + 1 = 20 19 20 8 + ☐ = 20 12